Final answer:
Soymilk provides the most complete protein out of the given options.
Step-by-step explanation:
Out of the given options, soymilk provides the most complete protein. Soymilk is derived from soybeans, which are legumes and are known for their high protein content. Legumes, including soybeans, are considered complete proteins because they contain all nine essential amino acids that our bodies need for proper functioning.