Final answer:
For a form fundraising letter where the recipients' names are not known, "To Whom It May Concern," followed by a colon is the most appropriate and professional salutation.
Step-by-step explanation:
When drafting a form letter for fundraising purposes, the most appropriate salutation would be a general greeting, since the exact recipient's name may not always be known. In this case, Kendra Washington should use "To Whom It May Concern," followed by a colon, as the salutation in her letter to past and potential contributors. This approach ensures that the letters remain professional and suitable for multiple recipients, regardless of their gender or title. Additionally, it is imperative that the salutation is followed by a blank line before continuing with the body of the letter, which will detail the clinic's progress, its contributions to the community, and the request for donations.