Which of the following indicates that a project is behind schedule?

A) A SPI value less than one
B) A SPI value more than one
C) A SPI value equal to one
D) A negative CV
E) A positive CV

A SPI value less than one indicates that the project is behind schedule, as this means that the project is not progressing as planned in terms of its schedule. A SPI value of one indicates that the project is on schedule, while a value greater than one means that the project is ahead of schedule. CV, on the other hand, measures the cost performance of the project, so it does not directly reflect whether the project is behind schedule or not.