The text states that in 1968, Nigeria was the "second producer of cocoa (203, 600 tonnes) after Ghana". This implies that Ghana was the top producer and produced more cocoa than Nigeria. The passage mentions oil palm and timber exports, but it does not claim they were Nigeria's "most important" export. The text also calls livestock an "ancient livestock industry", but does not label it as the "most important industry". The passage also mentions "Nigeria forests", whereas the option says "Nigerian forests". More importantly, option a is the primary intended key deduction regarding comparative production. The text states oil palm grows "wild and in plantation" and rubber was grown "by peasant farmers and, increasingly in plantation", so they are not always grown in plantations.