Which of the Following Identified Research Problems Has Enough Significance

Which of the following identified research problems has enough significance to warrant further development?

A) Children between 8 and 12 years do not eat the broccoli in their school lunches.
B) Women above 100 years old are at moderate risk for development of breast cancer.
C) Obese adults are at risk for development of type 2 diabetes mellitus.
D) The rate of sunscreen use among Aboriginal people is less than 10%.