Correct Answer: 936

Solution : Given:
1. I like chocolates ⇒ 958
2. We bought chocolates ⇒ 153
3. We like them ⇒ 816

By comparing all the above–coded sentences, we find that –
In sentences 1 and 2, chocolates is a common word and 5 is a common code.
In sentences 2 and 3, We are a common word and 1 is a common code.
In sentences 1 and 3, like is a common word and 8 is a common code.
The remaining word and code are in sentence 1 I and 9; in sentence 2 bought , and 3; and in sentence 3 them and 6 .
Finally, chocolates ⇒ 5; We ⇒ 1, like ⇒ 8, I ⇒ 9, bought ⇒ 3, them ⇒ 6

So, I bought them will be coded as 936 . Hence, the first option is correct.