In questions a part of the sentence is bold. Below are given alternatives to the bold part at (A). (B) and (C) which may improve the sentence. Choose the correct alternative. In case no improvement is needed your answer is (D).
The increasing sale of luxuries is an index of the country's prosperity.

Options

A. appendix
B. pointer
C. mark
D. No Improvement

Answer

D

Explanation

(4) No Improvement
index (Noun): indication
appendix (Noun) : a section giving extra information at the end of a book or document
pointer (Noun) : a sign that something exists
mark (Noun) : a sign/indication