While on a job interview, Mateo is asked about what he did in his previous job. Mateo responds by saying, "Well, um, I had to make phone calls and, like, get my boss’s coffee." Which of the following statements about Mateo's response is true?

A. Mateo used formal language because he was articulate.
B. Mateo used formal language because he was not overly emotional.
C. Mateo used informal language because he used colloquialisms.
D. Mateo used informal language because it contained verbal fillers.