Karen is in charge of ensuring that the processes at her bank run smoothly so that the business will be able to provide its services efficiently and effectively. Karen is a(n) manager.

Operations Manager

Explanation:

An operations manager is in charge of effective use of a company's resources to ensure smooth and effective running of the business to meet the company's goal. Functions of operations manager include handling the logistics of the organisation,planning, and strategy decisions, preparing budgets and inventories and developing operations standard procedures

idk

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."