Question

Which sentence does not contain any punctuation errors? A. He is often clumsy, on the other hand he dances beautifully. B. He is often clumsy, on the other hand, he dances beautifully. C. He is often clumsy; on the other hand, he dances beautifully. D. He is often clumsy on the other hand; he dances beautifully.

Answer 1

"He is often clumsy; on the other hand, he dances beautifully"
This one is the correct answer for a couple reasons:
One, the first one cannot be correct because the comma is used incorrectly. A comma can connect an independent clause (one that could be its own sentence) to a dependent clause (one that could not be its own sentence). The first part is an independent clause because it has a subject, 'He', and a predicate 'is'. The second part is also independent, so a comma cannot connect them. 
Two, the third one is incorrect because the phrase 'on the other hand' is a prepositional phrase, so a comma must follow it. 
Three, the second sentence is correct because the first section is an independent clause, and the second section is an independent clause as well. A semicolon can only connect two independent clauses. The comma is in the correct placement because it is after the prepositional phrase that I mentioned earlier.
I hope I helped, and good luck with your work!