Correct option is B
The correct option to fill in the blank is (b) own.
Explanation:
The word 'own' is used here as an adjective to emphasize that the actions belong to the individual mentioned. It follows the possessive adjective 'their'.
Example: I saw it with my own eyes.
Information Booster:
'Own' is frequently used after possessive adjectives (my, your, his, her, its, our, their) to intensify the sense of ownership or personal responsibility.
So the correct answer is (b)