Correct option is B
The correct option to fill in the blank is (b) solely.
Explanation: The sentence expresses the idea of complete personal accountability.
Solely means “only” or “entirely,” and matches both the tone and grammar of the sentence.
Correct sentence: I believe that we are solely responsible for our choices.
Meanings of the other options:
· (a) Ordinarily – usually, commonly (आम तौर पर).
· (c) Durably – in a long-lasting manner (टिकाऊ ढंग से).
· (d) Profusely – in large amounts (प्रचुर मात्रा में).