A solid understanding of is the foundation of verbal communication. a.spoken and written languageb. body languagec. non-verbal languaged. facial expressions

a. spoken and written language

Explanation:

body language, non-verbal language and facial expressions do not enough for verbal communication.

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a(n) clause should always be separated from the rest of the sentence by commas.

a(n) independent clause should always be separated from the rest of the sentence by commas.

an independent clause is a clause that can stand alone as a sentence (i.e., it expresses a complete thought). an independent clause, like all clauses, has a subject and verb. when there are no dependent clauses in the same sentence as an independent clause, the independent clause is a simple sentence.

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