The correct option is D 30
The number of equivalent molecules of ATP required to produce a molecule of glucose in C4 plants is 30. The C3 cycle requires 3 ATPs in each turn. For 6 turns (in order to produce one molecule of glucose), it requires 18 ATP molecules. In C4 plants, the C4 pathway requires 2 equivalent additional ATPs for each turn. So for 6 turns, it will require 12 equivalent additional ATP molecules. Altogether, 12 + 18 = 30 equivalent ATPs are required to produce one molecule of glucose.