The historic convention on Biological Diversity held in Rio de Janeiro in 1992 is known as

Options

A. a) CITES Convention
B. b) The Earth Summit
C. c) C-16 Summit
D. d) MAB Programme.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for the name of the historic convention on Biological Diversity that took place in Rio de Janeiro in 1992.

2. **Evaluating the Options**:
- **Option A: CITES Convention**: This convention was established in 1973 to protect endangered species of plants and animals. Since it was not signed in 1992, this option is incorrect.
- **Option B: Earth Summit**: The Earth Summit, also known as the United Nations Conference on Environment and Development (UNCED), was indeed held in Rio de Janeiro in 1992. This option is correct.
- **Option C: C16 Submit**: This option does not correspond to any known convention and is therefore incorrect.
- **Option D: MAB Program**: The Man and Biosphere (MAB) Program was initiated in 1971 under UNESCO. Since this also predates 1992, this option is incorrect.

3. **Conclusion**: After evaluating all the options, the correct answer to the question is **Option B: Earth Summit**.