题目选项分析

Robot satellites relay important communications and identify weather patterns. Because the satellites can be repaired only in orbit, astronauts are needed to repair them. Without repairs, the satellites would eventually malfunction. Therefore, space flights carrying astronauts must continue.

Which of the following, if true, would most seriously weaken the argument above?

【选项】Technical obsolescence of robot satellites makes repairing them more costly and less practical than sending new, improved satellites into orbit.