Answer:
The correctly punctuated sentence in this group is:
a. The team's major concerns this year, however, are staying healthy, finding a good shooting guard, and maintaining good relations with the public.
Explanation:
The word "however" must only be preceded by a semicolon when it is introducing a new sentence. This is not the case here. "However" is simply interrupting, so to speak, this sentence, but not adding another one to it. Besides that, adding dashes after the verb that introduces a list of items is also incorrect. Since the list is not long, no punctuation is really necessary. If it were a longer list, then a colon would suffice. With that in mind, we can choose letter A as the correct option.
