By the Triangle Inequality, the sum of the lengths of any two sides of a triangle must be greater than the length of the remaining side. Therefore, BC+AB>AC, or 2+AB>12. Thus, AB>10, which eliminates options (A), (B), and (C). Also by the Triangle Inequality, BC+AC>AB, or 14>AB, which eliminates choice (E). Therefore, of the given choices, only choice (D), 12, could be the length of side.