Which of the Following Statements Is Not True

Which of the following statements is not true?

A) Human activities may increase the dangers from certain geologic hazards.
B) Many geologic hazards have existed throughout human history.
C) Certain problems, such as resource shortages, will become less severe when other planets or the moon are colonized in the next few decades.
D) Some environmental problems, such as those related to pollution, were unrecognized until very recently.