we use the sinus law,
[tex]\begin{gathered} \frac{a}{\sin A}=\frac{c}{\sin C} \\ \frac{26}{\sin 88}=\frac{21}{\sin C} \\ \sin C\times\frac{26}{\sin 88}=21 \\ \sin C=21\times\frac{\sin 88}{26} \\ \sin C=0.807 \\ C=\sin ^{-1}(0.807) \\ C=53.8 \end{gathered}[/tex]
answer:
b) m
