Options:
A.
B.
C.
D.
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Earlier discussion
1 older comment kept for context.
Solomon
THE PROBLEM HAS A MEASURE OF AMBIGUITY. THE OPTION SELECTED AS THE CORRECT ANSWER (ie OPT ION D, 3 pi bonds) WOULD BE TRUE IF, AND ONLY IF THE ALKENE IS A TRIENE (AN ALKENE WITH 3 CARBON-CARBON DOUBLE BONDS), WHICH THE PROBLEM DIDN'T SPECIFY. IF THE ALKENE IS A SIMPLE ALKENE, WHICH HAS ONLY ONE CARBON-CARBON DOUBLE BOND, THEN THE NUMBER OF PI BONDS IS ONE. THEREFORE, THE CORRECT ANSWER IS NOT AMONG THE OPTIONS.