Cho a,b>0; log3 a=p; log3 b=q. Đẳng thức nào dưới đây đúng? log3 ((3^r)/(a^mb^d))

A. ${\log }_3\left(\frac{3^r}{a^m{b}^d}\right)=r+p.m-q.d$

B. ${\log }_3\left(\frac{3^r}{a^m{b}^d}\right)=r+p.m+q.d$

C. ${\log }_3\left(\frac{3^r}{a^m{b}^d}\right)=r-p.m-q.d$

D. ${\log }_3\left(\frac{3^r}{a^m{b}^d}\right)=r-p.m+q.d$