Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) Hillary Clinton and her husband, former President Bill Clinton, combined to earn more than $153 million in paid speeches from 2001 until Hillary Clinton launched her presidential campaign last spring, a CNN analysis shows. In total, the two gave 729 speeches from February 2001 until May, receiving an average payday of $210,795 for each address. The two also reported at least $7.7 million for at least 39 speeches to big banks, including Goldman Sachs and UBS, with Hillary Clinton, the Democratic 2016 front-runner, collecting at least $1.8 million for at least eight speeches to big banks. The analysis was made at a time when Hillary Clinton has been under scrutiny for her ties to Wall Street, which has been a major focus of Vermont Sen. Bernie Sanders on the campaign trail.In total, the two gave 729 speeches from February 2001 until May, receiving an average payday of $210,795 for each addressThe two also reported at least $7.7 million for at least 39 speeches to big banks, including Goldman Sachs and UBS 
 Question:The former secretary of state testily responded to _' charges.

Bernie Sanders