Which shows a correct order to solve this story problem?

Isabel rode her bike 18.9 miles this week. She rode her bike 3 times farther last week than this week.

How far did Isabel ride her bike in the two weeks?

A.
Step 1 Multiply 18.9 × 3.
Step 2 Subtract 18.9 from the product.

B.
Step 1 Multiply 18.9 × 3.
Step 2 Add 18.9 to the product.

C.
Step 1 Divide 18.9 by 3.
Step 2 Add 18.9 to the quotient.

D.
Step 1 Divide 18.9 by 3.
Step 2 Subtract 18.9 from the quotient.