|Question 16Verbal

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Working with equipment designed for a billionths of a meter scale,       
Which choice completes the text so that it conforms to the conventions of Standard English?
synthesized selenium nanoparticles used to target harmful cells in the body without damaging other cells have been created by nanoengineers.
A
nanoengineers have synthesized selenium nanoparticles that are used to target harmful cells in the body without damaging other cells.
B
nanoengineers synthesized selenium nanoparticles are used to target harmful cells in the body without damaging other cells.
C
selenium nanoparticles that have been synthesized by nanoengineers to target harmful cells in the body without damaging other cells.
D