Final answer:
Albert Bandura is most closely associated with the Bobo Doll studies and is the researcher who proposed the concept of observational learning.
Step-by-step explanation:
The researcher most closely associated with the Bobo Doll studies is Albert Bandura. Bandura researched modeling behavior, specifically how children model adults' aggressive behaviors. His landmark Bobo doll experiment demonstrated that children who observed an adult behaving aggressively towards a Bobo doll were more likely to imitate that aggressive behavior when given the opportunity, a concept Bandura termed observational learning.
Regarding the question of who proposed observational learning, the correct answer is c) Albert Bandura. Bandura's contribution was significant in understanding how individuals, especially children, learn behaviors from observing others. This discovery was part of Bandura's broader social-cognitive theory, which also includes concepts such as reciprocal determinism and self-efficacy.