The question is about correct usage of the word 'alike'. Option A uses 'alike' correctly, indicating 'similar in their approach'. Option B, while a valid sentence using 'alike' is too extreme an example as it says the twins 'looked exactly the same' . Option C is grammatically incorrect as it uses the preposition 'alike'. Option D is not grammatically correct as 'alike' is incorrectly used as a preposition. The key is to understand that 'alike' is an adjective or adverb used to compare similarities between two or more things. Thus option A is most appropriate.