Final answer:
The three needs in McClelland's acquired needs theory are the need for achievement, the need for power, and the need for affiliation, where the need for power is about influence and control over others.
Step-by-step explanation:
The second need in McClelland's acquired needs theory is the need for power. This theory asserts that individuals acquire three types of needs as a result of their life experiences: the need for achievement, the need for power, and the need for affiliation. Unlike Maslow's Hierarchy of Needs, which is more biologically and universally based, McClelland's theory revolves around needs that are acquired or learned over time. Specifically, the need for power is concerned with having control or influence over others and is distinct from the need for achievement, which focuses on personal success and goal attainment, and the need for affiliation, which centers on interpersonal relationships.