Correct Answer - Option 4 : Computers
The correct answer is 'Computers'.
- Here, in the given fill-in-the-blank the most appropriate noun is 'Computers'.
- In the given sentence auxiliary verb 'are' is used.
- Hence, it should be preceded by a plural noun.
- And the plural of the noun 'Computer' is 'Computers'.
- Therefore, as per the points mentioned above, we find that the correct answer is Option 4.
Correct Sentence: Computers are very expensive.