The central government has come up with a cash voucher scheme to encourage people to spend their savings on good.

The grammatical error of the sentence is in option D. Here the use of the noun ‘good’ is incorrect. This is so because there are some nouns that have different meanings in their singular and plural forms. ‘Good’ means an approval/appreciation or validation for some task and ‘goods’ means merchandise or possessions. So, according to the given sentence latter should be used here. Thus, replace “good” with “goods” to make the sentence grammatically correct. Correct sentence: The central government has come up with a cash voucher scheme to encourage people to spend their savings on goods.