What is a CheeseBurger

A cheeseburger is a hamburger topped with cheese. Traditionally, the slice of cheese is placed on top of the meat patty. The cheese is usually added to the cooking hamburger patty shortly before serving, which allows the cheese to melt. Cheeseburgers can include variations in structure, ingredients and composition.

Explanation:

A cheese burger is cheese that is on a peice of meat

Explanation:

c. get with the program

Explanation:

A "formal style" of writing uses more complex words and longer sentences in order to elaborate what the topic is all about. It is more "objective," thereby avoiding range of emotions. It doesn't involve contractions (such as "It's"), rather it uses full words.

The phrase in sentence 2 which should be revised is "get with the program." Such phrase is written in a personal tone and is colloquial in nature, thus it is informal.

Choices a, b and d are clearly written in a formal tone.

So, this explains the answer.