Answer:
The correct answer is B: That tree surely will have blown down.
Step-by-step explanation:
Option B is the correct option, as the past participle of this verb would be: "blown". In this sentence, it is used as a part of the future perfect tense, which consists of: will + have + past participle.
Option A cannot be considered as the correct answer, as it does not contain the past participle of this verb.