Definition of : Deliver
Newsroom
headline
caption
improve
property
parachute
comfort
transmit
update​

Deliver: bring and hand over (a letter, parcel, or ordered goods) to the proper recipient or address.

Newsroom:the area in a newspaper or broadcasting office where news is written and edited.

headline:A headline is the title of a newspaper story, printed in large letters at the top of the story, especially on the front page. ... The headlines are the main points of the news which are read on radio or television.

caption

improve:make or become better.

property: a thing or things belonging to someone; possessions collectively.

parachute:a cloth canopy which fills with air and allows a person or heavy object attached to it to descend slowly when dropped from an aircraft, or which is released from the rear of an aircraft on landing to act as a brake.

comfort:something that makes life more pleasant or convenient.

transmit:cause (something) to pass on from one place or person to another.

update:make (something) more modern or up to date

since it is asking for her reaction to elnora's trouble at school you can rule out any answers with a positive response (b). then you can rule out (d), this is because it does not show the mother's reaction but the daughter's response. that leaves you with two options (a) and (c), by looking at the options you can rule out (c) because it isn't referring back to elnora's issues at school.

answer is b,

"the tracer looks harmless in flight, but the pilot’s bitten lips and white knuckles suggest how dangerous it can be."

it was correct.