To determine which option the author would most likely agree with, we need to consider the general themes of envy, social status, and the nature of competition among people based on their achievements or privileges.
A) suggests that men in power are envious of existing nobility. However, typically, those in power pursue their own social standing rather than feeling envious of those who are already established.
B) indicates that privileged individuals are envious of those who suddenly advance, which aligns with a common theme in discussions about social dynamics—wherein established privileges can generate envy towards new risers.
C) proposes that people who stay at home envy travelers. This seems a bit too specific and doesn't address broader social dynamics.
D) states that individuals excelling in one skill are envious of those excelling in multiple skills. While this might have some validity, it’s quite narrow in scope and doesn't encompass broader social or political themes.
Based on these analyses, B) seems the most likely to reflect an understanding of social dynamics, where established privilege can provoke feelings of jealousy towards those who rapidly ascend in status. Therefore, the author would most likely agree with B).