Who among the following introduced the concept of entitlements in food security ?
1. M. S. Swaminathan
2. Atul Pranay
3. Samali Srikant
4. Amartya Sen
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The concept of entitlements in the context of food security and famines was introduced by the Nobel laureate Amartya Sen in his seminal 1981 book, Poverty and Famines: An Essay on Entitlement and Deprivation.

Sen shifted the focus from food availability (the supply side) to food access (the demand side). He argued that famines can occur even when there is no overall shortage of food, provided that certain groups lose their "entitlements"—the legal means to acquire food through production, trade, labor, or transfers. Starvation occurs when a person's entitlement set does not include a bundle with enough food.

M. S. Swaminathan is primarily known for his role in the Green Revolution and increasing food production (availability). Statements 2 and 3 do not refer to individuals recognized for introducing this specific economic concept.