select the most appropriate word to fill in the blank.
When I solved the sum ______ I was very happy.

Options

A. i) myself
B. ii) herself
C. iii) itself
D. iv) oneself

Explanation

The pronoun ‘I’ is the first-person singular nominative(or subjective) case personal pronoun. It is used to refer to one.s self. However, the grammatical variants of ‘I’ are me, my, mine, and myself. Hence, myself will be the most appropriate answer.