中国大学MOOC: Which of the following aptitudes is required by a simultaneous interpreter?

中国大学MOOC: Job skills can also be called transferable skills, since they are the type of aptitudes you acquire through work experience.

Which of the following aptitudes is required by a simultaneous interpreter? A: Pleasant voice and public-speaking skills. B: A language degree. C: In-depth knowledge of a third language. D: Maintenance of SI equipment.