Final answer:
Option 2: Rice and beans is the combination of plant foods that will provide sufficient amounts of all nine essential amino acids.
Step-by-step explanation:
Option 2: Rice and beans is the combination of plant foods that will provide sufficient amounts of all nine essential amino acids. Unlike the other options listed, rice and beans together form a complete protein source because they complement each other's amino acid profiles. This combination is commonly consumed across many cultures and is a staple in several cuisines.
Learn more about essential amino acids