Answer:d. Both A & C
a. In violation of the JMU Honor Code.
c. guilty of plagiarism.
Explanation: JMU Honor code aims to encourage academic integrity which means not being dishonest in one's academic work such as using certain material without acknowledging that it is not originally produced by you.
Matthew also committed plagiarism because he took all the work from all these sources but never cited and referenced the sources , so now he is using the work that isn't originally his as if it was his , stealing someone else's work and ideas.