The process of photophosphorylation was discovered by

Options

A. Calvin
B. Arnon
C. Priestley
D. Warburg.

Answer

### Step-by-Step Solution:

1. **Understanding Photophosphorylation**:
- Photophosphorylation is the process of converting ADP and inorganic phosphate (Pi) into ATP using light energy during photosynthesis.

2. **Key Discoveries**:
- The process was discovered by Daniel Arnon and his colleagues. They observed the formation of ATP from ADP and inorganic phosphate during photosynthetic electron transfer.

3. **Supporting Research**:
- Albert Frenkel also contributed to this discovery by identifying the light-dependent production of ATP in chromatophores, which are found in photosynthetic bacteria.

4. **Conclusion**:
- The findings led to the conclusion that light energy captured by photosynthetic systems is transformed into the energy stored in ATP's phosphate bonds. This process is known as photophosphorylation.

5. **Final Answer**:
- The process of photophosphorylation was discovered by Daniel Arnon.