【单选题】

Questions 144-146 refer to the following memorandum.

To:All employees
From:Director Jack Lee, Human Resources
I regret (144) you that after 20 years of service to this agency, with the last 5 years as a vice president,Daniel W. Lewis is resigning to start (145) own new career at another company.During his tenure as a vice president, Mr. Lewis oversaw the development of the state-of-the-art domestic appliances, which brought us into the global market.
In addition, sales of our products have tripled during the perioD、We thank him for his significant (146) to this company and wish him well in his future endeavors.
A、contributions
B、tasks
C、responsibilities
D、changes