in which situation would it be most appropriate to use an informal writing style?\n a letter of…

in which situation would it be most appropriate to use an informal writing style?\n a letter of recommendation\n a report on photosynthesis\n an e - mail to the mayor\n a postcard to a friend
Answer
Brief Explanations:
Formal writing is used for professional, academic, or official - like situations. A letter of recommendation, a report on photosynthesis, and an e - mail to the mayor are formal contexts. A postcard to a friend is a personal and informal communication.
Answer:
a postcard to a friend