Physiological needs
Answer: C
Explanation
The theory of Maslow classifies needs from the most important to the least important.
There are needs that human beings cannot leave without.
There are also that they need to pleasure and make their life luxurious.
There are primary needs that should be fulfilled before anything else.
Until the primary requirements are satisfied, there is nothing else that matters.
Therefore before addressing the requirements, it is crucial to study the pyramid to extract the physiological needs to be happy first as the rest follows.