Mashaal Masha
Atoms in a synchrotron, a type of circular particle accelerator, travel faster and faster until they ________ a desired energy level, at which point they are diverted to collide with a target, smashing the atoms.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A: 

will reach

B: 

reach

C: 

had reached

D: 

are reaching

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