Matt is the editor of the literary magazine. he likes that his publication is creative and he does not want to hurt anyone's feelings by saying their work is not good enough to publish. he does not want to argue with anyone about what goes into the magazine so he mostly works by himself. the quality of the magazine sometimes suffers because he does not ask for and does not turn away any submissions.
a- respectful enforcer
b-warlord
c- doormat
d- peace maker

C- Doormat

Explanation:

- A respectful enforcer is a person that is capable of handling conflict and managing the division of work.

-Warlord is someone that is dominant and control all the work.

-Doormat is when a person accepts everything, adapt to the others and constantly give but they don't receive.

-Peace Maker is when someone helps to solve issues and reach solutions.

According to this, the answer is that Matt is a doormat because he doesn't express his opinions because he doesn't want to hurt anyone and he  doesn't ask for help and does all the job.