In 2016, engineer Vanessa Galvez oversaw the installation of 164 bioswales, vegetated channels designed to absorb and divert stormwater, along the streets of Queens, New York. By reducing the runoff flowing into city sewers, ________

Which choice completes the text so that it conforms to the conventions of Standard English?

Question

Accepted Answer

the bioswales have mitigated both street flooding and the resulting pollution of nearby waterways.

Answer

the mitigation of both street flooding and the resulting pollution of nearby waterways has been achieved by bioswales.

Answer

the bioswales' mitigation of both street flooding and the resulting pollution of nearby waterways has been achieved.

Answer

both street flooding and the resulting pollution of nearby waterways have been mitigated by bioswales.