Answer:
deception
Explanation:
it was his key ️ to their minds and heart<em><u> </u></em><em><u>but </u></em><em><u>they </u></em> did not know
We cant answer that because you never gave us the sentence (there is no sentence so i cant find the <span>pronoun used within the object of preposition) ?</span>
Answer:
This is the answer of your question.