Which of the choices below correctly joins these two sentences using coordination?

Eating too much junk food can lead to weight gain. I should consider cutting back on potato chips.

Eating too much junk food can lead to weight gain, so I should consider cutting back on potato chips.

Some people don't like being told what to do. They follow directions effortlessly.

The correct choice to join the two sentences using coordination is:

"Eating too much junk food can lead to weight gain, so I should consider cutting back on potato chips."

To join these two sentences using coordination, you can use coordinating conjunctions such as "and," "but," or "or."

Let's apply these options to the given sentences:

1. Eating too much junk food can lead to weight gain, and I should consider cutting back on potato chips.
2. Eating too much junk food can lead to weight gain, but I should consider cutting back on potato chips.
3. Eating too much junk food can lead to weight gain, or I should consider cutting back on potato chips.

Among the given options, option 1 is the correct choice as it joins the two sentences using the coordinating conjunction "and." This creates a compound sentence, combining the two separate ideas.