[单选题]
An object is thrown upward wit/p9*k;xsskvdiz4 u4kh a speed of 15 m/s on z8nfqqyd8s y-,2jc 7bnj6eh, the surface of planet X where the acceleratio2jf7cdy-,zn6s,q eqjn 8 hby8n due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?
A. $6.0 \; s$
B. $8.0 \; s$
C. $10 \; s$
D. $12 \; s$
