Final answer:
The sentence in question is a declarative sentence, which makes a statement and ends with a period.
Step-by-step explanation:
The sentence 'A feast is a meal that is rich and abundant and includes many guests' is a declarative sentence. This type of sentence states a fact or an opinion and ends with a period. It is used to convey information, similar to other declarative sentences such as 'The administration canceled classes' or 'Thousands of women currently serve in the military.' It is not asking a question, giving a command, or expressing a strong emotion, which rules out it being classified as interrogative, imperative, or exclamatory.