[单选题]
An object with a mass of $m$ is connected to a spring on a frictionless horizontal surface.
The object is displaced by $x$ from its equilibrium point $O$ to point $A$ and executes simple harmonic motion with a period of T. Which of the following are true if the object is displaced by $2x$?
I. The angular frequency of the oscillation will be less.
II. Total energy of the object will be greater.
III. The average speed of the object will not change.
A. Only $I$
B. $I$ and $II$
C. Only $II$
D. $II$ and $III$
