Correct Answer: 40

Solution : Given:
(I) grapes are multi red is coded as 8 6 4 3
(II) red people eat mango is coded as 7 4 5 2
(III) mango multi apple is coded as 3 5 0.

On comparing the sentences I and II the word and number red and 4 are common.
On comparing the sentences I and III the word and number multi and 3 are common.
On comparing the sentences II and III the word and number mango and 5 are common.
The remaining word and number in the sentence I are grapes , are and 8 , 6 . In sentence II are people , eat, and 7 , 2 . In sentence III apple and 0 .
Here the codes are; Red→4; Multi→3; Mango→5; Grapes→8/6; Are→8/6; People→7/2; Eat→7/2; Apple→0

So, red apple is coded as 40. Hence, the second option is correct.