Final answer:
It is not possible to determine the horizontal length of CD without knowing the diameter of the tape.
Step-by-step explanation:
To determine the horizontal length of CD, we need to use the formula: L = (D^2 - d^2) / (2d), where L is the length of CD, D is the distance between the end marks on the tape, and d is the cross-sectional diameter of the tape. The given information states that the tape has a cross-sectional area of 0.0060 in^2 and a weight of 2.0 lb. However, we also need to know the diameter of the tape in order to calculate the length of CD. This information is not provided in the question, so it is not possible to determine the correct answer.