The halo effect occurs when . Group of answer choices we underestimate the influence of external factors on behavior our reaction to a person is influenced by other persons we judge someone based on the group to which he or she belongs our perception of one characteristic contaminates our perception of others

- Our perception of one characteristic contaminates our perception of others.

Explanation:

'Halo effect' is demonstrated as the cognitive bias that takes place when an initial positive impression about a person or thing dominates an individual's entire perception about that person or thing.

As per the question, this 'halo effect' occurs when 'our perception of one characteristic contaminates our perception of others' as it leads to dominating an individual's perception or opinion and thus, they tend to show a biased behavior towards that person and treats other as inferior or less impactful due to that 'stereotype fixed in the mind through the initial impression.'

the answer is tom watson. tom watson created this epitaph because he wanted to increase the sympathy felt by people towards the murder of mary phagan.