Which sentence could be added to best support the idea that Kelly Slater was working with aerospace engineers?
A) By 2005, Kelly received over a million dollar in endorsements, which he used to open surfing schools.
B)Kelly Slater graduated from the University of California with a liberal arts degree.
C) Through weeks of trial rides, Slater helped the inventors calibrate the height of the waves tube.
D) Kelly Slater was given the surfer of the year award by Time magazine.