$\begin{array}{l}\text{Here,}\\ \\ \Rightarrow {\text{(?)}}^{\text{2}}{\text{+ (65)}}^{\text{2}}{\text{= (160)}}^{\text{2}}-{\text{(90)}}^{\text{2}}-\text{7191}\\ \\ \Rightarrow {\text{ (?)}}^{\text{2}}{\text{= (160)}}^{\text{2}}-{\text{(90)}}^{\text{2}}-\text{7191}-{\text{(65)}}^{\text{2}}\\ \\ \Rightarrow {\text{ (?)}}^{\text{2}}\text{ = 25600}-\text{(8100 + 7191 + 4225)}\\ \\ \Rightarrow {\text{ (?)}}^{\text{2}}\text{ = 25600}-\text{19516}\\ \\ \Rightarrow {\text{ (?)}}^{\text{2}}\text{ = 6084 }\Rightarrow \text{\hspace{0.17em}\hspace{0.17em}(?) = }\sqrt{\text{6084}}\text{ = 78}\end{array}$

Hence, Option E is correct.