Two identical objects of mass m are placed at either end of a spring of spring constant k and the whole system is placed on a horizontal frictionless surface.
at what angular frequency ω does the system oscillate?

Explanation:

It is given that two identical masses is attached to the either end of the spring

with spring constant k

angular frequency of the system is given by

here

Thus

this is poiselle's equation from fluid mechanic in physics. mech eng

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )