Which explanation best describes how to solve this problem?

sally talked on the phone for 45 minutes each day for 6 days. on the 7th day she talked on the phone for 30 minutes and on the 8th day she talked on the phone for 40 minutes.

how many minutes did sally talk on the phone in eight days?

a.
multiply 45 × 6. then add 30 and 40 to the product.

b.
divide 45 by 6. then add 30 and 40 to the quotient.

c.
add 45 and 6 and 7 and 30 and 8 and 40.

d.

add 45 and 6. then add 30 and 40. then add the two sums together.