[单选题]
An object is on a frictf8 js5cplo oel cj8+0 hkj dcgfzu9m2/,2f6 c-ionless inclined plane. T zcvav ap9c)8;he plane is inclined at an angle of ca; c8v9ap)zv $30^{\circ}$ with the horizontal. What is the object's acceleration?
A. $0.50 \; g$
B. $0.56 \; g$
C. $0.87 \; g$
D. $1.0 \; g$
