Sammy Seller is under contract utilizing the Standard Offer to Purchase and Contract from NC REALTORS for the sale of his home to Betty Buyer. Betty and Sammy agreed that Betty would place a $1500 Earnest Money Deposit in the trust account of the listing firm, Topsail Realty within 5 days of the contract's effective date. More than a week after the contract is formed, Betty has not paid the EMD. Based on this information, what action can Sammy undertake?
A) Sue Betty Buyer for breach of contract.
B) Cancel the contract unilaterally.
C) Issue a demand letter for immediate payment.
D) Initiate arbitration proceedings against Betty Buyer.