Answer: Whether consent was voluntary
Step-by-step explanation:
From the question, we are informed that Sondra thinks the new business contract she signed with her business partner is valid. We are further told that both parties are legally competent, the contract has a legal purpose, an offer was made and accepted, and a fee has been negotiated and documented.
The essential element of a valid contract has Sondra not yet considered is whether consent was voluntary. This is important as they je must not be forced to sign a contract.