Answer:
B. the casting director.
Explanation:
Since George is a producer who wants to make a movie and he has a script but has trouble or difficulty in selecting the right side actors for a few roles. To resolve this challenge, George should approach the casting director for help.
A casting director can be defined as an individual who is primarily saddled with the responsibility of selecting and matching actors, dancers, side actors, singers with specific roles or part in scripts of a movie. A casting director normally functions in the pre-production process of a movie and are expected to work closely with the producer and director so as to understand their requirements.