What would be the BEST explanation for the following. Both the cost variance and the schedule variance are negative, but the cost variance is lower than the schedule variance.
a) The project under spent because all work was not completed, but overspent for work that was done.
b) The project overspent due to increased costs yet completed some activities faster.
c) The project activities took longer than expected, but costs were lower.
d) The project underspent, because costs were lower than planned and activities were easier to complete than planned.