The answer to the blank is physical.
Energy of gamma rays is given by equation

here we know that
h = Planck's constant

now energy is given as


now by above equation



now for wavelength we can say



The answer is no, it would be impossible to see the beginning of the universe
I’m pretty sure the answer is C. Any change of state or movement requires energy
In terms of the scientific method, the immediate purpose of doing an experiment is gathering data. You cannot draw conclusions or form a proper hypothesis without some sort of basis and data.