Answer:
Selective perception.
Step-by-step explanation:
Selective perception can be defined as a cognitive distortion that makes a person perceive only those stimuli that are favorable to that person and matches his/her expectations, ignoring other stimuli that are contradictory.
The given scenario exemplifies the selective perception. In the given case, the notice that does not allow people in a wheelchair to view the zoo's baby panda is viewed differently by Marathon and Tully. They both perceived the situation according to their expectations. Marathon, who is not using a wheelchair, saw nothing bad in that whereas Tully, who is on a wheelchair, felt discriminated.
Thus the correct answer is selective perception.