Which of the following sentences is correctly punctuated?
Correct: A
Option A correctly uses a semicolon to join two independent clauses that are closely related in meaning without a coordinating conjunction. Option B is a comma splice. Option C is also a comma splice, as 'however' is a conjunctive adverb requiring a semicolon before it (or a period) and a comma after. Option D misuses a colon, which is typically used to introduce a list or an explanation.