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The sentence given in the question has asked for an adjective that can be used to compliment the word leader.
What is an adjective?
In linguistics, an adjective is a word that changes the word or phrase of a noun or describes its meaning. Its semantic role is to transform the information conveyed by the noun.
Adjectives describe or modify — that is, limit or define the meaning — of nouns and pronouns. They may say attributes of all kinds: big, red, angry, very big, unique, unusual, etc.
An adjective usually comes before the noun: "red robe," "fifteen people." When an adjective follows a linking action such as or appears, it is called a predicate: "That building is large," "The staff seems happy."
As per the given information, Kelly is an example of an excellent leader.
Thus, The correct word to fill the statement is Excellent.
To learn more about Adjective, refer:
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