If {X: 2 d- x d- 19; X integer} and 7 + x = 4 (mod 9), find the highest value of x?

A. 2

B. 5

C. 15

D. 18

Correct Answer: Option C

**C. 15**

If {X: 2 d- x d- 19; X integer} and 7 + x = 4 (mod 9), find the highest value of x?

A. 2

B. 5

C. 15

D. 18

Correct Answer: Option C

**C. 15**

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