What does the slang word 'night hawk' mean?

What inference can be made about the characters beliefs

Which sentence is written using formal language? a) erin has a crucial appointment early monday morning. b) that was a real bogus tale charlie told the teacher. c) let me have a sneak-peak or i am simply gonna explode. eliminate d) i do not think tim will be here today; he's playing hookie.

What is the best revision of this statement from the body of a cover letter?