Answer: The malicious boy
Explanation: The subject is the naming part. It tells you WHO the sentenced is about. When you read the sentence, ask yourself "WHO is this sentence about?" The person or thing the sentence is about the SUBJECT.
 
        
             
        
        
        
This sentence seems grammatically correct, but it’s wordy. if this is your sentence in an essay or something, i’d recommend splitting it into two. it could be something like “i do not dislike golf or tennis, and I actually enjoy swimming. Still, they can in no way replace the value of team sports.”
        
             
        
        
        
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Answer:</h3>
A. "The Dallas Cowboys, who wore blue, were the worst football team in the league."
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Explanation:</h3>
Nonessential clauses are phrases within a sentence that are unnecessary and only provide additional information; however, the sentence could still work without the clause.
Identifying Nonessential Clauses
One of the best ways to identify a nonessential clause is to take it out of the sentence. If the sentence still makes sense, the clause was nonessential. 
For example, the sentence, "The Dallas Cowboys were the worst football team in the league," still makes sense. You only lose a little information that was not needed to understand the sentence.
Comma Rules
Nonessential clauses are also known as interrupters. All interrupters need to be offset by commas. This means that there must be a comma before and after the interrupter. The only exception to this rule is if the interrupter is at the end of the sentence, so the period replaces the comma.
For example, "The movie had a great action scene, which was my favorite part." In this sentence, the interrupter is at the end, so there is only one comma.
We can use this information to answer this question. Only answer choice A has the clause offset by commas, so this clause must be nonessential.