Cho \(\int\limits_0^3 {2f\left( x \right){\rm{d}}x...

Câu hỏi: Cho \(\int\limits_0^3 {2f\left( x \right){\rm{d}}x}  = \int\limits_0^2 {3{x^2}dx} \) và \({\rm{ }}\int\limits_0^3 {g\left( t \right){\rm{dt}}}  =  - 1\), khi đó \(\int\limits_0^3 {\left[ {f\left( x \right) + 3g\left( x \right)} \right]{\rm{d}}x} \) bằng

A \(4\).

B \(7\)

C \(1\) .

D \(3\).