An Object Attached to a Spring Is Pulled Across a Horizontal

An object attached to a spring is pulled across a horizontal frictionless surface. If the force constant (spring constant) of the spring is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at $1.4 \mathrm {~m} / \mathrm { s } ^ { 2 }$ what is the mass of the object?

A) 28 kg
B) 24 kg
C) 31 kg
D) 36 kg