Hydrogen, the most abundant element in the universe, is the main component of most stars and makes up more
than 90 percent of mass in the universe. Yet hydrogen is
the smallest and lowest-mass of all the elements,
consisting of only a single proton and single electron.
What makes this passage an example of expository prose?
E

These are the questions, right?

A. It includes filler words and run-on sentences.

B. It uses complex sentences and precise vocabulary.

C. It expresses the author's feelings and emotions.

D. It gives a general impression of the subject.

Explanation:

The answer is:

It uses complex sentences and precise vocabulary. (So its B)

Hope it helps      :)

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).