20 POINTS!!!!!
Read these sentences:


All members of Abbeville Choir were thrilled by the appointment of Howard Stein, _______________. The choir will be performing the difficult Mendelssohn's Elijah at the spring concert and need Stein's leadership.


Which descriptive phrases should be added to help the reader understand why Stein's leadership would be useful the choir?
A. An experienced conductor, as choirmaster.
B. A well-known publicist, as public relations manager.
C. An award-winning artist, as set designer.
D. A master composer, as program planner.
I think it is A, am I right? please explain