A. doesn't fix it. It just adds a comma splice. But the thoughts are not made clear, and are still hard to understand.
You can fix a run-on by adding a semi-colon in the two independent sentences, like in d, separating the sentences to two individual sentences, like in c, and you can add a comma and coordinating conjunction like in b. Know this and you should be able to master run-on sentences.
Answer:
Keplan
Explanation:
You should try Keplan, it gives students the opportunity to learn fast with easy step by step learning process.
The figure of speech being used here is Simile. (The comparison of two or more things using “like” or “as”).
Hope this helps!