Answer B. (Future perfect tense is used, as the sentence refers to something that will be completed by some point in the future.) is correct.
B is correct because the event which will happen in the future (the baking of the cakes) will also have ended.
I will have baked is a correct form of future perfect, because future perfect is made with the following construction:
Subject + will have + past participle
Answer:
The following tips will help you understand this classic story. ... Cause and effect ..... “No,” said Ulrich with a laugh, the idiotic chattering laugh of a man unstrung with hideous fear. “Who are they?” asked Georg quickly, straining his eyes to see what the other would gladly not have seen. ... man unstrung with hideous fear.” 2.
Explanation:
The quotations that use imagery are Have you not made an universal shout, / That Tiber trembled underneath her banks
&
And do you now strew flowers in his way, / That comes in triumph over Pompey's blood?