Why did Mr. Frank offer an invitation to the Van Daan family to stay with them in hiding?

the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.