|Question 20Verbal

Source Texts

Text
Several advantages—the ability to react strongly with chip components, to avoid interference from other waves, and to be confined within tiny circuits—       acoustic waves as a promising alternative to electrical waves for transmitting data on computer chips; as a result, researchers are invested in developing more acoustic wave-based chips.
Which choice completes the text so that it conforms to the conventions of Standard English?
having positioned
A
positioning
B
by positioning
C
have positioned
D