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Suppose Ruth Ann has 4 routes she can choose from to get from school to the library, and 5 routes from the library to her home

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Suppose Ruth Ann has 4 routes she can choose from to get from school to the library, and 5 routes from the library to her home. How many routes are there from Ruth Ann’s school to her home with a stop at the library?

A.120

B.20

C.25

D.16