The expression of electric power $$(P)=$$
Correct option is B. $$VI$$
Power is the rate at which work is done. It is the work/time ratio.
So, $$Power=\dfrac { Work\quad }{ Time } ,\quad That\quad is,\quad P=\dfrac { W }{ T } $$.
The expression for work is $$Work=Force\times Displacement.\quad That\quad is,\quad W=F\times s.$$, and so the expression for power can be rewritten as $$P=\dfrac { F\times s }{ t } .$$
Hence, in the given expression, the symbols F and s represent Force and displacement.
$$P = \dfrac {VIt}{t}= VI$$.