Answer:
B. "As kids, we often made up reasons to visit Mrs. Jahnke, whose cakes and pies were famous throughout the neighborhood."
Step-by-step explanation:
In this sentence, the relative clause "whose cakes and pies were famous throughout the neighborhood" provides additional information about Mrs. Jahnke. The comma after "Mrs. Jahnke" helps to separate the main clause from the relative clause and makes the sentence clear and grammatically correct.