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Data Sufficiency: The Question Stem - What is the Issue?

What is the distance from Town A to Town C? >(1) Town A is 30 km from Town B. >(2) Town C is 40 km from Town B.
Correct. [[snippet]] Statement (1) provides data concerning Towns A and B only, so (1) Insufficient → BCE. Statement (2) provides data concerning Towns B and C only, and so by itself (2) Insufficient → CE. You must now combine the statements. But is the data sufficient? Can you be sure how Towns A and C relate to each other? It is possible that all the towns are in a straight line (creating a distance of \$\$30+40=70\$\$ km from A to C), but the statements do not make this the only option. For example, Town C could be 40 kilometers to the right of Town B, creating a triangle between A, B, and C. The distance from A to C will then be different than 70 km. No single value can be determined, so (1)+(2) Insufficient → E.
Incorrect. [[snippet]] Statement (1) provides data concerning Towns A and B only, so (1) Insufficient → BCE. What about Town C?
Incorrect. [[snippet]] Statement (2) provides data concerning Towns B and C only, so (2) Insufficient. What about Town A?
Incorrect. [[snippet]] Statement (1) provides data concerning Towns A and B only, so (1) Insufficient → BCE. Statement (2) provides data concerning Towns B and C only, and so by itself (2) Insufficient → CE. You must now combine the statements. But is the data sufficient? Can you be sure how Towns A and C relate to each other? Try drawing a simple map. Then, try to draw it again, differently.
Incorrect. [[snippet]] Statement (1) provides data concerning Towns A and B only, but what about Town C? Statement (2) provides data concerning Towns B and C only, but what about Town A?
Statement (1) ALONE is sufficient, but Statement (2) alone is not sufficient to answer the question asked.
Statement (2) ALONE is sufficient, but Statement (1) alone is not sufficient to answer the question asked.
BOTH Statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
EACH statement ALONE is sufficient to answer the question asked.
Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.