b) and c) are fine. I would avoid a). You could use sufficiently in place of enough .
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azzCan one saya. We heated the plastic enough to melt. b. We heated the plastic enough to melt it. c. We heated the plastic enough for it to melt. ? And could one replace 'enough' with 'sufficiently'? Many thanks.The core meaning of the above sentences is clear enough to understand. However, I think I would write it differently.