The correct answer is A. To find good players, he scouted women’s softball clubs, which were very popular at that time.
Step-by-step explanation:
Although combining two or more sentences to create a longer a complex sentence might not be easy for some students there are steps that can help you in the process this includes checking the revision preserves the original meaning and essence of the sentence combined; combining sentences in a way it is grammatically correct and combining sentences according to the relationship between the sentences.
In the case of the sentence (7) and sentence (8), sentence (8) relates to sentence (7) because it describes the term "women's softball clubs" and therefore the relationship between both sentences is a dependence relationship which can be established by using subordinating words such as that, which, when, etc. This implies, the sentence that correctly combines both of sentence is "To find good players, he scouted women’s softball clubs, which were very popular at that time" because this sentence uses the subordinating conjunction "which" to establish the relationship between both sentences have and also, this is the only sentence that is both grammatically correct and preserves almost all the elements of both sentences.