Independent clauses: 1. Rely on semicolons to make sense 2. Tell us more about other parts of the sentence 3. Should never be separated by semicolons 4. Are clauses that make sense when they stand alone

4. Are clauses that make sense when they stand alone.

Explanation:

Independent clauses are clauses or groups of words that complete a thought and make sense when they stand as a sentence. In simple words, independent clauses make a full, meaningful sentence without the help of any other clauses or dependent clauses.

While dependent clauses require independent clauses to make a meaningful sentence and be accepted as a sentence, independent clauses need no such addition. As the word "independent" suggests, independent clauses are "independent" and can stand alone.

Thus, the correct answer is option 4.