Consider the following statements about Dr. Ram Manohar Lohia :
1. He believed that satyagraha with out constructive work is like a sentence without a verb.
2. He wrote his Ph.D. thesis paper on the topic of Salt Satyagraha, focusing on Mahatma Gandhi's socio-economic theory.
3. He recognized that caste, more than class, was the huge stumbling block to India's progress.
Which of the statements given above is/are correct?

Options

A. 1 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3