[单选题]
An object is on a frictionless inclined 24cs tdra*im. plane. The plane is gi *h8ww/ps 1c. 2rujkinclined at an angle of2 guwis/p. rc81kj*wh $30^{\circ}$ with the horizontal. What is the object's acceleration?
A. $0.50 \; g$
B. $0.56 \; g$
C. $0.87 \; g$
D. $1.0 \; g$
