Which of the phrases (a), (b), (c) and (d) given below should replace the phrase given in bold in the following sentence to make the sentence grammatically meaningful and correct ? If the sentence is correct as it is and No correction is required, mark (e) as the answer.

They are yet to decided about buying the new furniture.

A. still decide

B. yet to decision

C. yet to decide

D. still decided

Please do not use chat terms. Example: avoid using "grt" instead of "great".