Hello!
There are two types of tumors, which are benign and malignant tumors.
Benign tumors are tumors that do not invade its surrounding tissue or spread around the body. It grows slowly. Malignant tumors are tumors that invade the surrounding tissue and spreads around the body. This type of tumor grows rapidly.
So therefore, the answer is B, tumors that grow fast and spread to neighboring tissues.
Well, people in South Africa can't have a proper healthcare, and thinking with logic, it's not too good. Also, lack of food and water is a problem, because, for example, children are malnourished and they die at the young age because of diseases caused by they haven't eaten properly, like- you know what I mean.
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