[单选题]
A 2.0-kg mass is hung from a spr nfg:nth-x x2 ;: oemzzf*ko*-ing of nhulu:7ir /z8spring constant 18 N/m, displaced slightly from its equilibrium position, and released./u8zun h:i rl7 What is the frequency of its vibration?
A. $0.48 \; Hz$
B. $0.95 \; Hz$
C. $1.5 \; Hz$
D. none of the above
