TREC 38-8 is the buyer's termination notice. The reason you check matters, and the clock is merciless.
The common exits
(1) Option period — unrestricted, but notice must REACH the seller by 5:00 PM on the final day
(2)/(3) Financing — Buyer or Property Approval failed under the 40-11, lender statement attached
(5) Seller's Disclosure — late or missing notice under ¶7B(2)
(7) Title objections — uncured by the end of the Cure Period
After the notice
The notice is not an election of remedies — the earnest-money release under ¶18 is a separate step. Send the release with the notice and save a round trip.
Educational only — not legal advice. TREC forms are for use by trained license holders; talk to your broker or an attorney about your specific transaction.