Employees must wash his or her hands before returning to work.
The subject of the sentence is the word "employees," which is plural. It is also third person; therefore, you must you use the possessive pronoun their.
940 MCQ for effective preparation of the test of Nouns and Pronouns of English Grammar section.
Read the MCQ statement: Employees must wash his or her hands before returning to work., keenly and apply the method you have learn through the video lessons for Nouns and Pronouns to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 165-4444.