Final answer:
Karen's basis in her Frost shares is $20,000, and her holding period begins on the date she contributed the services.
Step-by-step explanation:
Karen's basis in her Frost shares is determined by the value of the services she contributed. She contributed services worth $20,000, so her basis in the shares is also $20,000.
Her holding period for the Frost shares begins on the date she contributed the services.