smc

From the problem, we are given: $whatsis=so$ $whosis=is$ $so+so=is\cdot so$ We want to find what $whatsis\cdot whosis$ is when $whosis=so$, $so+so=so\cdot so$, and $is=2$. Since $is=2$ and $so+so=is\cdot so=so\cdot so$ (from the given), that means $so=2$. Now we know that $whatsis=2$ and $whosis=2$ as well because they are equal to $so$ and $is$, respectively. Plugging in the values, we get $whatsis\cdot whosis=so\cdot is=4$. This also means that $whatsis\cdot whosis=so+so$. Taking a look at the answer choices, we see that our answer is $\boxed{so\text{ and }so}$.