Correct Answer:
Option D - 'Themselves' is appropriate because the subject (children) is plural therefore plural possessive adjective (their) and plural reflexive pronoun, (themselves) will be used.
Correct sentence–
You should tell these children to complete their projects themselves.
D. 'Themselves' is appropriate because the subject (children) is plural therefore plural possessive adjective (their) and plural reflexive pronoun, (themselves) will be used.
Correct sentence–
You should tell these children to complete their projects themselves.