Answer: The correct option is (A) E20e.
Step-by-step explanation: We are to find the most likely next step in the following series:
A4a, b8B, C12c, d16D, . . ..
The first letters are A, b, C, d, . . .. So, the next letter in this series will be E.
The second numbers are 4, 8, 12, 16, . . ..
That is, 4 × 1, 4 × 2, 4 × 3, 4 × 4, . . . . So, the next number in this series will be 4 × 5 = 20.
The third terms are a, B, c, D, . . .. So, the next letter in this series will be e.
Thus, the next step in the given series is
E20e.
Option (A) is CORRECT.