An equation is shown below:

5(3x − 4) = 1

Which of the following correctly shows the first two steps to solve this equation?

A. Step 1: 8x + 1 = 1; Step 2: 8x = 0

B. Step 1: 15x − 4 = 1; Step 2: 15x = 5

C. Step 1: 8x − 9 = 1; Step 2: 8x = 10

D. Step 1: 15x − 20 = 1; Step 2: 15x = 21