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Conjunctive adverbs (e.g., therefore, however, moreover, consequently) connect two independent clauses and must be preceded by a semicolon and followed by a comma when they appear mid-sentence. Option B follows the correct structure: “The data were incomplete; therefore, we postponed the release.” Option A commits a comma splice by joining two independent clauses with only a comma. Option C omits the comma after “therefore” and adds an erroneous comma after “we,” interrupting the subject–verb flow. Option D also yields a comma splice. On the PERT Writing section, sentence-boundary control is critical: use a period, a semicolon, or a comma plus a coordinating conjunction (FANBOYS) to join independent clauses. With conjunctive adverbs, remember this reliable template—“…; however, …”—to avoid splices and ensure professional, clear prose suitable for academic writing, reports, and email communication.