Which of the following is missing punctuation?

my cat likes sleeping in the window and my dog likes sleeping on me.
my dog and my cat both enjoy sleeping during the day.
i have a cat and a dog who like to sleep on me during the nighttime.
i like the way my cat sleeps with the dog during naps.

The correct answer is A. My cat likes sleeping in the window and my dog likes sleeping on me.

Explanation:

In writing, the punctuation refers to the use of comma (,), period (.), semicolon (;), colon (:) and others used to separate different element withing a sentence according to strict grammar rules. In the case of the sentence "My cat likes sleeping in the window and my dog likes sleeping on me" this is a compound sentence that integrates two main ideas, the first one is "My cat likes sleeping in the window" and the second one is "my dog likes sleeping on me" and in this case besides using the conjunction "and" to separate both a punctuation mark and more specifically a comma is required as "My cat likes sleeping in the window, and my dog likes sleeping on me". On the other hand, other sentences presented are simples sentences and do not require any punctuation. Therefore it is the first sentence the one that is missing a punctuation mark.

its repetition emphasizing that the chain is his own. sorry if i am wrong.