Answer:
B. a fixed-price contract.
Step-by-step explanation:
"A fixed price contract places minimum administrative burden on the contracting parties, but subjects the contractor to the maximum risk arising from full responsibility for all cost escalations. Also called firm price contract."
Mr. Plow couldn't come back to Springfield because he took full responsability for all cost escalations.
Reference: WebFinance Inc. “What Is Fixed Price Contract? Definition and Meaning.” BusinessDictionary.com, 2019