In the year 2001, Germany approved a $32 million credit to India for the purpose stated in each option. Let`s explore each one:

Option 1 suggests that the money was to promote primary education in select states. Although education is a plausible area for financial aid, it`s not correct in this context.

Option 2 says the credit was for the Tehri Dam project. Infrastructure development is a common reason for such loans; however, this is not accurate for this particular credit.

Option 3 implies that the credit was to assist in the development of nuclear facilities. While Germany has been involved in such projects globally, it is not the correct response here.

Option 4, the correct answer, states that the credit was granted for oceanographic research. This choice is accurate, indicating that the credit was meant to support scientific studies regarding the physical and biological aspects of the ocean. This reflects Germany`s commitment to supporting scientific and environmental studies worldwide.