The complete subject tells whom or what the sentence is about. For example( The house, The red car, the great teacher.
Cancer would most likely be:
PRONOUN
A set of words that is complete in itself, typically containing a subject and predicate is a sentence.
A set of words that is complete in itself, typically containing a subject and predicate, conveying a statement, question, exclamation, or command, and consisting of a main clause and sometimes one or more subordinate clauses.
A conjunctive adverb, a verb and a pronoun are all parts of speech and not a set of words.
Therefore, the correct answer is option A.
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