Select the term that will come next in the following series.

2B, 4D, 7G, 12L, 19S, 30D, 43Q, ?

Given: 2B, 4D, 7G, 12L, 19S, 30D, 43Q, ?

Logic: Letters are increasing prime number and difference between the number is prime numbers.

4 - 2 = 2, 7 - 4 = 3, 12 - 7 = 5, 19 - 12 = 7, 30 - 19 = 11, 43 - 30 = 13

The next prime number is 17

So, 43 + 17 = 60

B → D (+2), D → G (+3), G → L (+5), L → S (+7), S → D (+11), D → Q (+13)

The next letter should be:

Q + 17 = H

The next series is 60H.

Thus, correct option is (a).