Question

this is the best ..... we can do
a) that
b) who
c) whom
d) which
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Answer 1

a.) that.................

Answer 2

This is the best that we can do.

Answer: Option a)

Explanation:

Who, which and that are relative pronouns. Pronouns are words that are used instead of a noun. Relative pronouns are used before an adjective clause. 'Who' has other forms like whom and which. While, who and whom are used for people, that is used for animals or things and people.  

Example of who: The people who boarded the flight were dead due to sudden explosion.  

Example of whom: My friend whom we met at the school reunion is visiting us today.  

Example of that: My niece June wore the pretty pink dress that I got her for her birthday.