Step-by-step Solution:

In a certain code "SAND" is written as "UCPF". How is "STONE" written in that code?

Answer: (c) UVQPG

Explanation:

The coding rule is to add 2 to the position of each letter in the alphabet.

• S (19) + 2 = 21 → U
• T (20) + 2 = 22 → V
• O (15) + 2 = 17 → Q
• N (14) + 2 = 16 → P
• E (5) + 2 = 7 → G

Therefore, "STONE" is written as "UVQPG".