Which of these statements is true? maslow is known for his early work on classical conditioning alderfer developed a needs theory based on pavlov's early work. existence needs are the highest order needs. relatedness reflects people's need to be valued by others?

Classical conditioning allude to a learning procedure involving biological and neutral stimulus and it's known as the Pavlovian Conditioning Theory.

Abraham Maslow is mostly known for his "Hierarchy of Needs Theory", which was further developed by Clayton Alderfer and widely known as ERG, initials for "Existence, Relatedness and Growth".

And Relatedness is part of the STD, or Self-Determination Theory, with reference to motivation and personality, and the relation between psychological needs, the desire people have for maintaining important interpersonal relationships and what motivates people to make certain choices without external influence.

Also, people's need to be valued by others is more related to Relational Value or people with low-confidence and/or low self-esteem.

The statement that is closer to be true is the 4th one, although is not super explicit, is the righteous one.

The fourth statement is the true one:

The first statement is not true because it is Ivan Petrovich Pavlov who is known for his work on classical conditioning.

The second statement is not true because Clayton Paul Alderfer developed a needs theory based on Maslow's hierarchy of needs.

The third statement is not true because according to Abraham Maslow, the existing needs include physiological desires which are at the bottom of his hierarchy pyramid.

The fourth statement is true. Relatedness needs according to Alderfer depend on external (social) relationships and acceptance.