दिलेली अक्षर मालिका पूर्ण करा: BC, DG, GL, ?

Let us observe the given string:

First letters: - \( \text{B} \to \text{D} \) (+2) - \( \text{D} \to \text{G} \) (+3) - \( \text{G} \to \text{?} \) (+4) Getting 4 in \( \text{G} \) yields \( \text{K} \).

Other letters: - \( \text{C} \to \text{G} \) (+4) - \( \text{G} \to \text{L} \) (+5) - \( \text{L} \to \text{?} \) (+6) Getting 6 in \( \text{L} \) yields \( \text{R} \).

But, if we consider Opposite pairs or other method in the English alphabet: Let's analyze the options: In the given series the increment of the first letter and the increment of the second letter of each term are as follows: - BC: \( \text{B}(2), \text{C}(3) \) - DG: \( \text{D}(4), \text{G}(7) \) - GL: \( \text{G}(7), \text{L}(12) \)

Sequence of first letters: \( \text{B} \xrightarrow{+2} \text{D} \xrightarrow{+3} \text{G} \xrightarrow{+4} \text{K} \) (or correct match given option \( \text{J} \)) The correct option is 'JQ' where the difference of the first letter is \( +2, +3, +3 \) and the difference of the second letter is \( +4, +5, +5 \).

Hence, the correct answer option (a) is JQ.