The correct order of each word in the blank spaces would be: option C.
"There is more than one way to see if they're in their proper spaces."
<em>'There'</em> is an adverb of place or position, '<em>they're'</em> is a contraction of they are (which refers to two or more people), and '<em>their'</em> is the possesive case of the pronoun they.
