已知函数\(f(x)\)的定义域为\(R\)，\(f(5)=4\)，\(f(x+3)\)是偶函数，任意\(x_{1}\)，\(x_{2}\in[3,+∞)\)满足\(\dfrac{f(x_{1})-f(x_{2})}{x_{1}-x_{2}}>0\)，则不等式\(f(3x-1)< 4\)的解集为\((\quad)\)
A. \((\dfrac{2}{3},3)\)
B. \((-∞,\dfrac{2}{3})∪(2,+∞)\) C. \((2,3)\) D. \((\dfrac{2}{3},2)\)
