Ammeter readings: A = B = C.
Work Step by Step
The 3 bulbs are in parallel, and have the same voltage across them. For two or more devices connected in parallel, the voltage is the same across each device. This is Rule 1 for parallel circuits, on page 444, and discussed on pages 443-444. Because the bulbs are identical, and the voltages are the same, the current through each is identical.