Richest source of protein in vegetarian food is–

Correct option is C

Option (a): Incorrect
• Lentils are good protein sources but contain much less protein compared to soybeans.
Option (b): Incorrect
• Potatoes have very low protein content.
Option (c): Correct
• Soybeans contain the highest protein content (≈40%) among all vegetarian foods.
• They have complete amino acid profile comparable to animal proteins.
Option (d): Incorrect
• Green peas contain moderate protein but are far below soybeans.