Question

Which of the following sentences are grammatically correct? (Select all that apply.)
The students' pens are on the desk.
The student's pens are on the desk.
The students' pen's are on the desk.
The student's pens' are on the desk.

Answer 1

although ‘students’ doesn’t need a comma after the ‘s’ unless there’s something to say about the subject. the answer is the second one.

Answer 2

Answer: the first one

Explanation:

the students pens are on the desk, not the student is pen is are on the desk.