Electrical Power & Heating Effect question from JEE Main 2014 (19 Apr, Shift 1)

Answer: (c)

1. All four bulbs are in parallel across 220 V, each drawing $I = \frac{100}{220} \approx 0.45$ A.
2. The ammeter sits on the bottom wire between $B_1$ and $B_2$, so it carries the return current of $B_2$, $B_3$, $B_4$ only.
3. $I_A = 3 \times \frac{100}{220} \approx 1.35$ A. So the answer is (c).