Detailed Instructions: Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
Q: Problem: a technician makes a round - trip to and from a certain service center by the same route. if the technician completes the drive to the center and then completes 50 percent of the drive from the center, what percent of the round - trip has the technician completed ?
Options: a. 70, b. 65, c. 60, d. 75, e. 80
A:
d