—What's this in English?

—It's ______ pen.  It's _______ orange pen. [ ]

A. a, a

B. a, an

C. an, a

D. an, an

颅前窝骨折时，淤血区域多发生于

A、眼睑； 

B、结膜下； 

C、颞、颞下区； 

D、枕下、乳突区。