HSK C5
Correct

勤

/ qín / 
Strokes

Definition

diligent/industrious/hardworking/frequent/regular/constant

Example

As an Adjective
hardworking
As a Noun
(hard) work; duty; service
As a Noun
attendance
As an Adjective
diligent; industrious; assiduous
As an Adjective
frequent; constant; regular