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What are the essential elements of an independent clause?

-a subject and a complete thought

-a subject, a verb, and a complete thought

-a verb and a complete thought

-a complete thought

The answer is: a subject, a verb, and a complete thought

Explanation:

Independent clause is a type of clause that can stand alone and still have a meaning.

I like chocolate that is made in Switzerland. - this sentence consists of two clauses. The underlined clause is the independent one, we see that it can function as a sentence even without the dependent clause.

Its essential parts are subject, verb (predicate) and a complete thought. It also can contain objects, adverbials ... but they are not a must.