Concept:Introductory “there” is used to state that something exists or is present.Explanation:The sentence needs a word that introduces the existence of multiple options.In such expressions, “there” is the correct introductory word, as in “There are many options.”“Their” and “theirs” are possessive forms and do not introduce existence.“There’s” is a contraction of “there is” and cannot be used before a plural noun.Therefore, the word that best completes the sentence is “there.”Answer:C. there