Question

which event caused gretchen to search the house?
a news reports warned that a big storm was coming.
b gretchen heard strange noises on the roof.
c hans said he needed different tools to fix the pipes.
d aunt agatha said she hid their cell phones.

Explanation:

Without further context from the story, we assume that hearing strange noises on the roof would prompt someone to search the house to investigate. The other options (news about a storm, need for tools, cell - phones being hidden) are less likely to directly cause someone to search the entire house.

Answer:

B. Gretchen heard strange noises on the roof.