The present international treaty regarding antarctica:
options:
a. divides the land among the twelve nations claiming rights to it.
b. allocates petroleum and mineral rights among the twelve original treaty signers and eleven other nations.
c. prohibits radioactive-waste disposal, weapons testing, and military related activities on the continent.
d. all of the choices are correct.

C. Prohibits radioactive-waste disposal, weapons testing, and military related activities on the continent

Explanation:

The Antarctica treaty which was signed in 1959 and still in usage stipulates all military activities , radioactive testing and disposal, weapon testing activities should be prohibited. The treaty is only modifiable every 30 years .

Presently , mineral exploration are not allowed.

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]