Which of the Following Statements Is the Best Example of a Hypothesis

Which of the following statements is the best example of a hypothesis about human development?

A) All the children in the high-scoring group were breast-fed as infants, which explains their higher levels of achievement.
B) If breast milk is a superior supplement for infant brain development, then on psychological tests, children who were breast-fed as infants should perform better than children who were not breast-fed as infants.
C) Human breast milk contains nutrients that are essential for the formation of neurons and synapses in an infant's developing brain.
D) Cross-cultural studies have determined that human breast milk provides the ideal nutrition for infant brain development.