Plz. which explanation best describes how to solve this problem?

jan walked 4 kilometers, skated 3 times as many kilometers as she walked, and swam 1 kilometer.
how many kilometers did jan cover altogether
a multiply 3 × 4. add 1 to the product.

b subtract 1 from 4. then multiply the difference by 3.

c add 1 and 4. add that sum to the product of 4 × 3.

d divide 4 by 1. then add 3 and 4 to the quotient.