Delegate is the term used for assigning the responsibility of completing a task to another person.
If you delegate a task to someone, you are entrusting that task to another person. Usually the person that delegates a task has seniority over the other person. There are many synonyms for delegate that would also be appropriate to use in the blank, like transfer or assign.
Russians group became dominant.
When Joseph sees a frail man limping around the corner he owns, he will likely help if the costs of helping are small and Joseph will feel better about himself helping.
Helping someone in need corresponds to a form of empathy and altruism, which is based on the moral emotions we feel when we see a person in a situation that we have the ability to help.
According to the theory of social exchange, altruism only exists if the benefits to the helper outweigh the cost, so supported by this theory, the letter b is correct, and Joseph will help the man if the costs of helping are small.
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