Which explanation best describes how to solve this problem?

cindy rode her bike for 10 miles, ran for twice as many miles as she rode her bike, and swam for 2 miles.

how many miles did cindy cover altogether?

a.
divide 10 by 2. then add 2 and 10 to the quotient.

b.
add 10 and 2 and multiply the sum by 2.

c.
add 10 and 2 and 10 and 2.

d.
multiply 10 × 2. then add 10 and 2 to the product.