Step 1: Approach:
Think of the suspense account as a ledger. It has a debit balance now, so the closing entry must put a credit in it.
Step 2: Find the credit entries:
Options 2 and 3 credit Profit and Loss Suspense A/c. Options 1 and 4 debit it, so they cannot close it.
Step 3: Choose who is debited:
The deceased partner has already been settled. His capital is not charged again, so option 3 is out. The continuing partners share the firm's profit, so their capital accounts take the debit.
Step 4: Read the result:
This gives Gaining Partners Capital A/c Dr. To Profit and Loss Suspense A/c, which is option 2.
Final Answer:
Option 2 closes the suspense account.
\[ \boxed{2} \]