The current in a wire varies with time according to the equation `i=4+ 2t`, where `i` is in ampere and `t` is in second. The quantity of charge which passes through a cross-section of the wire during the time `t= 2 s` to `t = 6 s` is
Options:
(a) `40C`
(b) `48C`
(c) `38 C`
(d) `43 C`