Can u help me please be right this is a big assignment

Third

Explanation:

It uses the commas in the correct places, imagine that the commas are pauses when you are speaking.

EX:

We went to the park, (pause) there was amazing ice-cream there.

Also, you spelled write wrong, you used "right"

"Right" is used like this:

I knew i was right.

"Write" is used like this:

I love to write essays.

Good job though

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