Mark against the correct answer in each of the following:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

For any three vectors $\overrightarrow{\mathrm{a}}, \overrightarrow{\mathrm{b}}, \overrightarrow{\mathrm{c}}$ the value of $[\overrightarrow{\mathrm{a}}-\overrightarrow{\mathrm{b}} \overrightarrow{\mathrm{b}}-\overrightarrow{\mathrm{c}} \overrightarrow{\mathrm{c}}-\overrightarrow{\mathrm{a}}]$ is 

A. $2[\vec{a} \vec{b} \vec{c}]$ 

B. 1

C. 0

D. none of these