Each of the sentences provided may contain a grammar or usage error. read each sentence and then identify its error, if there is one , by choosing the appropriate letter. if there is no error in the sentence, choose no error.
when you completed your homework so dilligent, i knew that you had changed your attitude about accomplishing your academic goals.
a.) when you completed
b.) so diligent
c.) i knew that you had changed
d.) academic goals.
e.) no error

i think b. it should be "so diligently"

i hope this helps :-)

So diligent is the error in the sentence.

Explanation:

Diligent is an adjective while diligently is an adverb, therefore they have a different function in a sentence, the adjective will affect a noun, and an adverb will mostly affect a verb, in the sentence "When you completed your homework so diligent" the word that is being affected is the verb completed so the word to describe how did the person do the action is the adverb diligently.