Final answer:
In a Hawaii real estate contract, the required element for it to be valid is consideration, which involves the exchange of something of value between the parties.
Step-by-step explanation:
The element always required for a Hawaii real estate contract to be valid is b) Consideration. Consideration refers to something of value that is exchanged between the parties involved in the contract.
It could be money, services, or anything else of value agreed upon by both parties.
A valid contract must include an offer, acceptance, competent parties, legality of purpose, and mutual consent, in addition to consideration. The other options listed, such as attorney review (option a), earnest money (option c), and profit (option d), are not always required for a contract to be legally binding.
correct option b) Consideration.