[单项选择]You are taking over a project and determine the following: Activity B has an early finish(EF)of day 3, a late finish(LF)of day 6, and an early start(ES)of day 2. Activity L is being done by a hard-to-get resource. The cost performance index(CPI) is 1.1 and the schedule performance index(SPI)is 0.8. Based on this information, what would you be more concerned about ?() A. Float B. Resources C. Cost D. Schedule