Question

Formal and informal letters may have a similar structure but informal letters do NOT need to be

Answer 1

A.Typed if there typed then that is still okay but it is informal letters informal things are not usually typed

Answer 2

Formal and informal letters may have a similar structure, but informal letters do NOT need to be formatted for it's purpose. 

Answer: D. formatted for its purpose.

Good luck with your studies, I hope this helps~!