1. Carriage Out: Debit side too high by $90 (Correction: Credit Suspense $90).
2. Purchases Returns: Credit side (returns) too high by $100 (Correction: Debit Suspense $100).
3. Wrong Person: No effect on Suspense (Debit/Credit match).
4. Rent: Income ($350 Cr) put in Expense ($350 Dr). Total error is $700 on debit side (Correction: Credit Suspense $700).
Net correction: $90 (Cr) - $100 (Dr) + $700 (Cr) = $690 Credit. To clear this, the opening balance must have been $690 Credit.

This is a critical reasoning assumption question. The argument concludes that more deer will be hit by cars once the housing is occupied. We must find what the argument must silently assume for its conclusion to hold.

The argument’s logic chain:

1. Deer feed at forest edges.
2. New roads create new forest edges.
3. Therefore, deer will gather near roads → more deer-vehicle collisions.

For this conclusion to be possible, there must still be deer in the forest. If the development destroyed so much forest that the deer population collapsed or disappeared, there would be no deer left to collide with cars. The argument must assume that enough forest survives to sustain a substantial deer population — i.e., Option D.

• A — About commercial vehicles; the argument concerns cars from residents, not commercial traffic. Distractor.
• B — Compares road edges to house edges; the argument only requires deer near roads, not near houses.
• C — Past collision numbers are irrelevant; the argument is about a future increase, not about whether the prior baseline was low or high.

Correct Answer: D. Without a surviving deer population, the conclusion about increased collisions becomes impossible.

Nutritional Rickets — deficiency of Vitamin D leading to impaired bone mineralization.

Pathophysiology:

\[\downarrow \text{Vit D} \Rightarrow \downarrow \text{Ca}^{2+}\,\text{absorption (gut)} \Rightarrow \downarrow \text{Serum Ca}^{2+} \Rightarrow \uparrow \text{PTH} \Rightarrow \downarrow \text{Phosphate (renal loss)} \Rightarrow \text{Impaired mineralization}\]

Clinical features:

• Rachitic rosary: Bony swellings at costochondral junctions
• Harrison's sulcus: Horizontal groove along lower chest (diaphragm pull)
• Craniotabes: Ping-pong ball sensation (skull)
• Bossing: Frontal bossing
• Widened wrists/ankles
• Bow legs (genu varum) or knock knees
• Delayed dentition, hypocalcemic tetany

Labs: \(\downarrow\) Ca, \(\downarrow\) PO₄, \(\uparrow\) ALP (markedly), \(\uparrow\) PTH, \(\downarrow\) 25-OH Vitamin D

X-ray: Cupping, fraying, splaying of metaphyses (especially distal radius)

Treatment: Vitamin D \(1000{-}5000\,\text{IU/day}\) for 3 months + calcium supplementation.