Respuesta :
Probably B. If it's to protect, the animal sounds like it was going to die off by 1972.
Answer:
Option B, Scientists monitored and observed the decline of marine mammal populations in the world's oceans.
Explanation:
The Marine Mammal Protection Act in 1972 was enacted with the motive of preserving the oceanic mammal species whose count has been reducing year on year. Thus, option B is correct
Option A cannot be correct as decrease in death rates of oceanic mammals will increase their population ultimately which in no case is a matter of concern due to which an act is required to bring in regulatory norms for preserving any animal species.