Find the next term in the series. 24, 30, 48, 78, 120, ?

The differences between consecutive terms are 6, 18, 30, 42. Notice that these differences themselves form a pattern with a constant second difference of 12 (18-6=12, 30-18=12, 42-30=12). The next first difference should be 42+12=54. Adding this to the last term gives 120+54=174. Option A (166) is too small, B (168) and D (202) don't fit the pattern.