Answer: The company prefers to have white Americans at top positions, is most likely the reason why Rohit was not promoted.
In this particular case, Rohit a marketing executive who has graduated from a top Ivy League university in the United States and has been known for his outstanding performance, positive attitude, and innovative ideas yet somehow Ryan, a white male with lesser experience and average performance, is promoted to the position of marketing manager.
This states that there is discrimination in this organization and they tend to hire white people over people of color.
Therefore, the correct option is (b).