Which answer choice most accurately rephrases the sentence containing the
idiomatic expression "keep a lid on"?
a. The meatpacking companies had tried to hide their secrets.
b. The meatpacking
c. The meatpacking
d. The meatpacking companies had tried to invite reporters to do
investigations.
companies had tried to stop their worst practices.
companies had tried to disprove Sinclair's findings.