If you are telling us to revise the sentence, one error is that there is a double negative. 'not' and 'un' would cancel each other, and the revised sentence 'I wouldn't say he's the nicest guy around, but I've seen him behave kindly before.'
B is the answer for the question
The preferred method for asking questions about cause and effect relationships is <span>an experiment.</span>
Answer:
- When the subject of the sentence represents the doer of the action, it is known as ACTIVE VOICE.
Eg: The man killed the snake
- A sentence is PASSIVE when the subject represents the receiver of the action.
Eg: The snake was killed by the man
