In "The Red-Headed League," why do the criminals plan to commit their crime on Saturday?

The correct answer for the question that is being presented above is this one: "B. They think that Sherlock Holmes will not crack the case until Monday."

Here are the following choices:

A. It would then be two days before anyone noticed the crime.

B. They think that Sherlock Holmes will not crack the case until Monday.

C. That is the night that the Red-Headed League always meets.

D. Jabez Wilson closes his shop early every Saturday.