Which sentence is punctuated correctly?

A. Ethan did not study hard for his test; consequently, he barely passed it.

B. The English teachers decided to eat barbecue likewise, the math teachers decided to as well.

C. Karen's parents told her that her bank account was empty therefore she couldn't buy a new pair of shoes.

D. The students claimed their electricity was off last night, nevertheless, the teacher gave the test to them.

The sentence that is punctuated correctly is sentence A.

Explanation:

When you have a conjunctive adverb linking two independent clauses, you should use a semicolon. In this case, the conjunctive adverb connecting the two clauses is consequently. As you can see, there is a semicolon before the conjunctive adverb and a comma after it. The comma following the conjunctive adverb indicates that this word is in initial position in the clause.

I would say that the best bet is A