[单选题]
An object is on a frictioeqh2s k5ver1drmp/ / 4eb*2adnless incliub3cqt8*)x)a8y5w8*a j( cx0fgp*u xigl rgsned plane. The plane is inclined at an angle oxi xlcp8q(xaj8 r0ta*5u)yg 8b *cu* )gfsw3gf $30^{\circ}$ with the horizontal. What is the object's acceleration?
A. $0.50 \; g$
B. $0.56 \; g$
C. $0.87 \; g$
D. $1.0 \; g$
