A Nonprismatic Cantilever Beam of One Material Is Subjected to Load

A nonprismatic cantilever beam of one material is subjected to load P at its free end. Moment of inertia $I_{2}=2 I_{1}$ . The ratio r of the
Deflection $\delta_{B}$ to the deflection $\delta_{1}$ at the free end of a prismatic cantilever
With moment of inertia $I_{1}$ carrying the same load is approximately: (A) $0.25$
(B) $0.40$
(C) $0.56$
(D) $0.78$