[单选题]
An object is on a frictionleb6a)pes:o,xb608+h vval. ynxg:nhk ss inclin06j-gl k mq,cced plane. The plane is inclined at an angle gq,cm kl-c0j 6of $30^{\circ}$ with the horizontal. What is the object's acceleration?
A. $0.50 \; g$
B. $0.56 \; g$
C. $0.87 \; g$
D. $1.0 \; g$
