The mechanical properties of some metals may be improved by incorporating fine particles of their oxides. If

Question:

The mechanical properties of some metals may be improved by incorporating fine particles of their oxides. If the moduli of elasticity of the metal and oxide are, respectively, 55 GPa and 430 GPa, what is the upper-bound modulus of elasticity value for a composite that has a composition of 31 vol% of oxide particles?
(A) 48.8 GPa
(B) 75.4 GPa
(C) 138 GPa
(D) 171 GPa