c
To get a magnified image of an object at infinity the image formed by objective lens will beat focus and if we want maximum magnification then the image formed by Objective should be at focus of the eye piece Hence length of telescope \(=f_0+F_e\)
Hene, \(t_0=\) tocal length of objective \(f_e=\) eyepiece lens
Hence, \(C\) is correct option.