$9.$ For a given physical situation, the relationship between variables m$\_\{1\}$; n$\_\{1\}$ and p is: m $=$ k $*$ p$/(3$n $^2)$ where is a constant. If for a certain physical process m doubles when n doubles, then in this process a $.$ p must double as well. p must increase by a factor of $4.$ c$.$ p must increase by a factor of $8$ d$.$ p must decrease by a factor of $2.$ e$.$ We cannot tell what happens to p without knowing what k is$.$