Select the sentence that is grammatically correct:

Option A is grammatically correct: it uses the proper auxiliary verb "is" with the adverb "increasingly" modifying the adjective "common." Option B incorrectly pairs the past tense "was" with the adjective "increased" instead of the adverb form. Option C lacks a verb entirely, making it an incomplete sentence fragment. Option D incorrectly uses the indefinite article "an" before an adjective, which is ungrammatical.

Step-by-step Derivation:
Grammar analysis:

• A: Subject "Your situation" + auxiliary verb "is" + adverb "increasingly" + adjective "common" = Valid structure.
• B: "was increased common" attempts to use past participle "increased" as an adjective but "increased" requires "more" or should be "increasingly" (adverb) — grammatically incorrect.
• C: "Your situation about increasingly common" has no verb; it's a sentence fragment — ungrammatical.
• D: "is an increasingly common" uses the indefinite article "an" before an adverb modifying an adjective; articles do not precede adverbs in this context — grammatically incorrect.