Hey guys I'm having difficulty understanding one of the questions about Terpenes Which of the following compounds requires the formation of three new carbon-carbon bonds when synthesized from isopentenyl pyrophosphate? (See attached photo) The answer is A. The solution states "In choice A, there are ten carbons and two rings. One new carbon-carbon bond is necessary to make a ten-carbon species and two more new carbon-carbon bonds are required to form the bicyclic system, so Choice A requires three carbon-carbon bonds when formed from 5-carbon isoprene derivatives." I don't really understand what they said in the solution. If we start with a 5-carbon isoprene, then 3 additional carbon-carbon bonds will result in an 11 carbon structure (2 carbons per carbon-carbon structure times 3= 6 carbons. 5 carbons isoprene plus 6 carbons = 11 carbons). Terpenes are pretty difficult subject for me so any help would be much appreciated.