|Question 18Verbal

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Text
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?
nanoengineers have synthesized silica nanoparticles that are used to administer medicines to specific cells in the body.
A
nanoengineers' synthesized silica nanoparticles are used to administer medicines to specific cells in the body.
B
silica nanoparticles that have been synthesized by nanoengineers are used to administer medicines to specific cells in the body.
C
synthesized silica nanoparticles used to administer medicines to specific cells in the body have been created by nanoengineers.
D