Final answer:
The best evidence for how individuals are affected by others is d) The desire to fit in is so strong that people sometimes conform to a group consensus even when it goes against their own judgment, as it directly refers to social conformity influenced by group pressure.
Step-by-step explanation:
Among the options provided, the piece of evidence that best supports the idea that people are affected by others is d) The desire to fit in is so strong that people sometimes conform to a group consensus even when it goes against their own judgment. This statement captures the essence of social influence and conformity at work. Solomon Asch's experiments confirmed that individuals might agree with something they know to be incorrect due to the desire to be liked or the belief that the group is more knowledgeable.
In contrast, the other options refer to our natural inclinations as humans to live in groups (b), or present hypothetical scenarios that don't directly answer how people are affected by others (c), or express a general dislike for the label of conformists which does not offer empirical support for social influence (a).