Question:
Mark the tick against the correct answer in the following:
$\left|\begin{array}{ccc}\mathrm{b}+\mathrm{c} & \mathrm{a} & \mathrm{a} \\ \mathrm{b} & \mathrm{c}+\mathrm{a} & \mathrm{b} \\ \mathrm{c} & \mathrm{c} & \mathrm{a}+\mathrm{b}\end{array}\right|=?$
A. $4 a b c$
B. $2(a+b+c)$
C. $(a b+b c+c a)$
D. none of these
Solution:
