The correct option is (D):
Explanation: To determine how far it is from town A to town B, let's analyze the statements:
- Statement A: "It is 10 km from town B to town C."
This gives us information about the distance from town B to town C but does not provide any direct information about the distance from town A to town B.
- Statement B: "There is a canal between town A and town B."
This statement indicates the existence of a canal but does not provide any information about the distance.
Since neither statement alone provides enough information to answer the question, and together they do not help in calculating the distance from town A to town B, the correct option is:
4: If the question cannot be answered even with the help of both statements taken together or separately.