In What Way Do the Actions of Modern Presidents Challenge

In what way do the actions of modern presidents challenge the central thesis of Richard Neustadt's argument?

A) by demonstrating that unilateral executive actions have little to do with persuasion
B) by illustrating how bipartisan negotiations can lead to legislative success
C) by showing that modern presidents use far less power than expected
D) by highlighting the disconnect between presidential persuasion and a president's personality