Which sentence demonstrates good cohesion?

1.
"I went to the Pick n Pay. I bought some bottled water. Besides, the weather was hot."

2.
"I went to Pick n Pay. I bought bottled water. The weather was hot."

3.
"I went to the Pick n Pay and bought water. Then I got cold".

4.
"I went to Pick n Pay and bought some bottled water because the weather was hot."

5.
"I went to Pick n Pay. Then I bought some bottled water. Additionally, the weather was hot."

4. "I went to Pick n Pay and bought some bottled water because the weather was hot."

The correct sentence that demonstrates good cohesion is option 4.

"I went to Pick n Pay and bought some bottled water because the weather was hot."

This sentence effectively uses "because" to provide a clear logical connection between going to the store and buying water.