Nate's work to solve a math problem is shown below. Problem: Leona traveled 25 miles in 2/3 of an hour. What was her average speed in miles per hour?
Step 1: 25 divided by 2/3=r
Step 2: 1/25 x 2/3=r
2/5=r

What was Nate's first error?
A. He used division instead of multiplication to model the problem in step 1.
B. He switched the divisor and the dividend when creating an equation to model the problem in step 1.
C. He replaced the wrong term with its reciprocal in step 2.
D. He should not have changed division to multiplication in step 2.