John is one of the survivors during typhoon Yolanda. He shared that many victims were swept away by huge logs that rolled down denuded mountains facing their hometown. Aside from flash flood what do you think is another factor that contributed to the staggering death toll of typhoon Yolanda?

A. Illegal mining
B. Illegal house construction
C. Illegal logging
D. Illegal flash flood

I NEED CORRECT ANSWER:)​