【单选题】

Hi-Tech Zone Industries is pleased to announce the appointment of three new staff members this month. The quality of these appointments is an indicator of our commitment to technological innovation and expansion into world markets.

Firstly, we’d like to welcome Michael J. Slater to our SalesDepartment. Michael has been recruited directly from Nashville University’s well-known business faculty. He’ll be part of a new sales team and be put in charge of the important task of boosting our presence inAsian markets. Michael is a business graduate who speaks and writes fluentChinese, and we’d like to welcome him aboarD、
OurDesign and Testing Unit now has an extra engineer. Her name is Sonia Rubinstein, an engineering graduate from the Newport Institute of Technology, who has a postgraduate degree in testing engineering. We’re sure she’ll be a valuable asset. Sonia is married and has one child and has recently set up house in nearby WaterfordEstate.
And finally, we have managed to recruit a star in the area of business psychology:Dr. Janet Pearson, formerly a lecturer at Seattle University, who will be heading our Market ResearchDepartment. Of course, she is not just a brilliant academic but also has nine years of senior management experience at IBM. Welcome, Janet!
What do the three people mentioned in the newsletter have in commonA．They graduated from the same university.
B．They work in the same department.
C．They have joined the firm recently.
D．They all have post-graduate degrees.