The correct answer is: None of these.
In case of continuous category/preparatory and /or complementary work between 15 and 45 meters should be treated as the actual distance traveled.
Option A: 20 meters is not the correct answer because it is not the actual distance traveled.
Option B: 25 meters is not the correct answer because it is not the actual distance traveled.
Option C: 30 meters is not the correct answer because it is not the actual distance traveled.
Option D: None of these is the correct answer because it is the only option that is consistent with the information provided in the question.