A

Step 1: Understand the relationship between self-inductance and mutual inductance. The mutual inductance (M) between two coils is given by the relationship \( M \leq \sqrt{L_1 L_2} \), where \( L_1 \) and \( L_2 \) are the self-inductances of the coils.

Step 2: Given the symbols in the problem, we recognize they represent these quantities. Thereby, we can conclude that the inequality holds. The mutual inductance cannot exceed the geometric mean of the self-inductances of the two inductors.

Therefore, the answer is option A.