Question

I don't know whether he is innocent
a. whether he is innocent
b. I don't know
c. he is innocent
d. I don't know whether ​

Answer 1

I don't know whether.

Option (D) is correct.

Explanation:

• I don't know whether is the correct option.
• Whether is a word that gives you a choice between alternatives.
• Here in this sentence it is used after i don't know which shows that the narrator is not sure about the innocence of the person he is talking about.
• Therefore the narrator has used the word "whether" as an alternative.
• Which means maybe the person is innocent or maybe he is not.