Answer: You need at least 1/3 of a mile of clear visibility
Explanation:
To pass another car safely when going 45 mph, you need to have at least one-third of a mile of clear visibility. This means it is not safe to pass if you cannot see in front of you, clearly around the vehicle, you are going into a turn, and more.
However, it depends on the circumstances. This can include your vehicle, their vehicle, and the speed of the person you are passing. When we look at the other answer options, neither of the other two would fit this context so we can be confident that the answer is "you need at least 1/3 of a mile of clear visibility".