Given the function $f(x)=5x^3+2x,$ which is the correct limit to calculate to find $f^{\text{'}}(x).$

A$.f^{\text{'}}(x)=\underset{h0}{lim}\frac{[5(x+h{)}^3+2x]-(5x^3+2x)}{h}$

B$.f^{\text{'}}(x)=\underset{h0}{lim}\frac{[5(x+h{)}^3+2(x+h)]-(5x^3+2x)}{h}$

C$.f^{\text{'}}(x)=\underset{h0}{lim}\frac{[(5x^3+h)+(2x+h)]-(5x^3+2x)}{h}$

D$.f^{\text{'}}(x)=\underset{h0}{lim}\frac{(5x^3+2x+h)-(5x^3+2x)}{h}$