Even though we don't know which number represents which dimension, it's immaterial, according to the wording of the question. The question merely asks how many cannisters can be loaded, not how many cannisters can be loaded upright, or on their sides, etc... A is insufficient because we DO need to know the exact dimensions of the cannisters themselves, and a general volume measure is insufficient, as the same volume could be found in cans of varying radius and height. B alone is insufficient, because we have no way of determining actual numbers. Together, A and B provide enough info to determine the exact dimensions of each cannister, and now we can figure how to pack them in so that we achieve maximum cartage. My answer is C...I think I'm right on this one.