A contractor undertook to finish a road in 40 days and engaged 100 men. After 35 days, he realized the work would be delayed, so he engaged 100 more men and finished the work exactly on time. If he had not engaged the additional men, how many days behind schedule would the work have been completed?
Options:
- A: 4
- B: 5
- C: 6
- D: 8
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