Steve is creating a document with proper nouns, which Word continues to identify as being misspelled.

Which of these steps should he do in this situation?

it's D. B and C are correct.

Explanation:

The options are:

A. Skip the Spell Checker.

B. Right-click the noun and choose to Ignore All.

C. Right-click and Add to the dictionary.

D. B and C are correct.

You can either right-click the noun and choose to Ignore all. or you can Right-click and add to the dictionary. And this is because you are correct this time, as a proper noun can have misspelled type of spelling. And this is because it is some other language word, and that's why.

answer; the correct answer is (operating system);

these  signals travel  down a part of the neuron called the axon, which is like a wire that carries the  signal  to othernerve  cells. on average a  nerve  cell sends a  signal  at about 50 meters per second, which is over 100  miles  an hour!