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A
Refuse because it's required by contract
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B
Agree to help if your union agreement and personal situation allow; communicate your status clearly to your supervisor
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C
Leave at your normal time without saying anything
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D
Complain loudly to your coworkers about it
Why this is the answer
Flexibility during peak periods is valued by USPS. However, this is also a situation where union rules and personal circumstances matter. The correct response demonstrates team orientation (willingness to help) while respecting proper channels (union agreement, personal obligations). Clear communication with your supervisor about your availability is professional. The worst responses are silent departure or public complaining.
Source: USPS 474 VEA, Flexibility and Teamwork