Nhận biết (M1)

Careful planning was essential for the success of the Deep Impact probe, which conducted a flyby of comet 9P/Tempel and then traveled to comet 103P/Hartley. The CONTOUR probe mission seemed similarly well planned, but engineers lost communications with the probe before it could achieve the mission goal of visiting comet 73P/Schwassmann-Wachmann. This shows that __________

Which choice most logically completes the text?

• A.

  the Deep Impact was more successful than the CONTOUR because it had fewer tasks to accomplish.

• B.

  having multiple mission goals ensures that a probe will accomplish at least one of its tasks.

• C.

  the CONTOUR would likely have accomplished its tasks if it had been sent somewhere other than comet 73P/Schwassmann-Wachmann.

• D.

  careful planning alone does not guarantee that a probe will accomplish its mission.