The Main Reason the Clayton Act Did Not Prove to Be

The main reason the Clayton Act did not prove to be organized labor's Magna Charta was that:

A) labor of a human being was interpreted by the Courts to be an article of commerce.
B) labor unions were considered to operate in interstate commerce.
C) it made it easier for employers to seek injunctions against unions.
D) employer activities, such as blacklisting of employees and discharge of union leaders, were not illegal.
E) all of these