Which of the following statements best describes the difference between complete and incomplete proteins?

• A. Complete proteins provide energy, while incomplete proteins are only involved in muscle repair.
• B. Complete proteins contain all essential amino acids, whereas incomplete proteins lack some essential amino acids.
• C. Complete proteins are high in both essential and non-essential amino acids, while incomplete proteins only contain non-essential amino acids.
• D. Complete proteins are derived only from animal sources, while incomplete proteins are found exclusively in plant sources.

Answer: (B)