Suresh refuses to be served coffee by visually impaired baristas, but he does believe in donating to the visually impaired. The following statements could explain why Suresh does not want to be served by visually impaired baristas.
1. He thinks that visually impaired are inefficient at serving coffee.
2. His parents have taught him to donate, instead of accepting services from challenged individuals.
3. He believes that his refusal to be served will have adverse consequences.
4. He feels joyous amongst visually impaired; sharing his life and caring for them. 

From the following, choose the option that BEST explains Suresh’s biased behaviour

(1): This statement suggests a negative stereotype that visually impaired individuals may be perceived as inefficient or incapable of performing certain tasks. Suresh's reluctance to be served by visually impaired baristas could be rooted in this stereotype.

(2): Suresh's upbringing and the values instilled by his parents may contribute to his preference for donating rather than accepting services from individuals he perceives as "challenged." This attitude may stem from a belief in charity over direct interaction.

(3): This statement does not directly address why Suresh refuses to be served by visually impaired baristas. It suggests a belief in adverse consequences, but the nature of these consequences and their relation to his biased behavior is unclear.

(4):This statement portrays a positive sentiment towards visually impaired individuals. It implies that Suresh feels joyous when interacting with them. This positive feeling contradicts the negative bias suggested by his refusal to be served by visually impaired baristas.

Therefore Option D: 1, 2 Only is the correct answer.