Identify the correct sentence. a. elena will collect the money, and daniel will count it. b. we will call you later, and you tell us then. c. the fig tree will bear fruit, but it takes time to ripen. d. ava will use the stairs, but emily rode the elevator.

"Ava will use the​ stairs, but Emily rode the elevator" is the correct sentence.

Explanation:

One of the first rules according to the use of commas is to use a comma before a coordinating conjunction, all of these sentences have a conjunction and a comma but the two sentences have to be independent in order to work out with this rule,option D is the only one that has two independent sentences since they have all the elements of speech.

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