Answer:
Statement A. is written the most clearly.
Explanation:
It is the only statement that clarifies exactly what is burning in the oven.
The answer is C. Oxen is a group of ox, similar to cacti being a group of cactus.
Answer:

Explanation:
The little boy has damaged the computer.<em> (Active voice)</em>
Changing the sentence into passive voice:
The computer has been damaged by the little boy.<em> (Passive voice)</em>
Answer:
sentence 4
Explanation:
that sentence is not needed for the paragraph to make sense