[单选题]
An object is on a frictiozl7 -d0an s-t9(pk)fps,bfys nless inclined62n 2.t 3dm kcc f-krp/iwrq9i plane. The plane is inclined at an angle p cmfk.tr-6i 22dwn9k3 r/ ciqof $30^{\circ}$ with the horizontal. What is the object's acceleration?
A. $0.50 \; g$
B. $0.56 \; g$
C. $0.87 \; g$
D. $1.0 \; g$
