【单选题】Choose an appropriate topic sentence for the following paragraph. Thousands of new people are born on our planet every day. The number of inhabitants in the world has already reached over six billion....
A.
Therefore, it is predicted that the world will face serious health problems in the near future.
B.
The rapid growth of the world's human population is the most important problem the world needs to address.
C.
One of the burning issues is the population explosion in third world countries.