Option A and C, say same thing - R2D2 can repair only Aeroplanes $-$ no other things it can repair. There is no mention in the passage about other tasks that R2D2 can perform. This makes options A and C false.
But the passage says that R2D2 is the only robot which can repair Aeroplanes.
No other robot can repair aeroplanes.
So, option B can be directly inferred from the passage.
Also this passage does not state that there others robots does not exist. This makes statement D false.