Select the most appropriate option that can substitute the underlined words in the given sentence.
Kiran’s teacher was doubtful on her success.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. doubtful of.
The preposition "of" links the adjective "doubtful" to the noun or noun phrase that represents what is being doubted.
For example, "doubtful of her success" means that there are doubts regarding her success.
The corrected sentence would be: "Kiran’s teacher was doubtful of her success." This phrasing indicates that the teacher was uncertain about Kiran's ability to succeed.