A. They do not write.
B. They are not writing.
C. They have not written.
D. They will not write.
Answer: They do not write.
A. They do not write.
B. They are not writing.
C. They have not written.
D. They will not write.
Answer: They do not write.
Additional Information: In the simple present tense, the negative form is 'They do not write.'