Concept:
Sanskritisation is an important sociological concept related to social mobility in Indian society.
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Step 1:
Sanskritisation refers to the process by which lower castes adopt customs, traditions, rituals, and lifestyles of upper castes to improve their social status.
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Step 2:
This term was introduced by Indian sociologist M. N. Srinivas.
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Step 3:
• Ramachandra Guha is a historian.
• Sharmila Rege is known for caste and gender studies.
• Amartya Sen is an economist and Nobel laureate.
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Step 4:
Hence, the correct answer is:
\[
\text{M. N. Srinivas}
\]
\[
\boxed{\text{(1) M. N. Srinivas}}
\]