[单选题]
An object is on a frictionless inclin ov px xsz5*r b9sau72 fkns1.vk1bh5x,:l:acnl2 qtah1mm1j6p1pk5d+c: 8x h1xovoed plane. The plane is inclined at an angle1+lc dpntvpxoo 2 1hak6 m:x5jm8hq11 of $30^{\circ}$ with the horizontal. What is the object's acceleration?
A. $0.50 \; g$
B. $0.56 \; g$
C. $0.87 \; g$
D. $1.0 \; g$
