If a project task must be completed on time in order for the entire project to be completed on time, the task is

The answer that fits the given blank above is LATEST FINISH TIME or LFT. This is the term that refers to the time when a project task should be completed in order for the whole project to be finished on time. Therefore, the task is now in its latest finish time. 

The reason the Mars Climate Orbiter crashed was that a. one program output thrust in terms of foot-pounds, and another program expected thrust to be expressed in terms of newtons.

The Mars Climate Orbiter:

Was expected to study the climate of Mars to gain more insight on the planet Crashed when there was a problem with the thrusters

The reason the problem develop was because there was a mismatch in the mass expectation when one program measured mass in foot-pounds and the other in newtons.

In conclusion, option A is correct.

Find out more about the Mars probes at link.