Answer: Dear Amoreena
Step-by-step explanation:
The standard salutation to use when writing a business letter is "Dear", which is then followed by the name of the person and closing with a colon.
Even though Lance and Amoreena are good friends who grew up living in the same area, it won't be appropriate just addressing him anyhow without using the proper salutation. This is an official letter and should not be treated as an informal letter.