News stories are most likely to be examples of what kind of writing?

Answer the question on the screen plzzz

What style should a speaker use when preparing a speech for his or her school's parent teacher association? a. excited b. casual c. strict d. formal

Ineed simplifying this thesis and making it easier to understand for the reader (more concise) "no matter how religious one may be, one’s faith tends to change under unexpected and challenging circumstances."