Answer:
C: it is raining very hard
Step-by-step explanation:
The phrase, "raining cats and dogs" is an idiom. An idiom is a phrase that has an established figurative meaning that is different from its literal meaning. However, the meaning of this idiom can be determined based on context clues. The sentence describes that Timothy had to slam the door and he was soaking wet. This shows that it was raining. Additionally, most people are upset when they get rained on hard, so his yelling implies that it was raining very hard.