The correct answer is option 4. (C) Varun took a cake and an apple pie to the party but only the cake was eaten.

The correct sentence is "Varun took a cake and an apple pie to the party but only the cake was eaten."

Here's the explanation:

"Varun took": This part of the sentence establishes that Varun brought something to the party.

"a cake and an apple pie": This lists the items Varun brought, including both a cake and an apple pie.

"to the party": This specifies the destination of Varun's action, indicating where he brought the cake and apple pie.

"but": This conjunction introduces a contrast or contradiction in the sentence, indicating that despite bringing both items, only one was consumed.

"only the cake was eaten": This clause clarifies that out of the two items Varun brought, only the cake was consumed.

The sentence is grammatically correct because it uses the indefinite article "a" before "cake" because "cake" begins with a consonant sound, and it uses the indefinite article "an" before "apple pie" because "apple pie" begins with a vowel sound. Additionally, it correctly uses "but" to contrast the two clauses, and it employs proper subject-verb agreement ("was eaten"). Overall, the sentence effectively communicates the intended meaning without any grammatical errors.