Q1 of MC. 2008 Independent Trial.
The answer is definitely (c), although i understand where you get the idea it could be (b). Since the instructions state to "Select the alternative A, B C or D that bet answers the question", (c) is the best answer. Choosing (b) implies a substitution reaction occurs, so H2(g) would also be a product - however this is not mentioned in the question. Further, addition reactions happen more spontaneously than substitution reactions, reaffirming (c) as the best option.