<Dd> Section 2: <Dl> <Dd> "Every person who shall monopolize, or attempt to monopolize, or combine or conspire with any other person or persons, to monopolize any part of the trade or commerce among the several States, or with foreign nations, shall be deemed guilty of a felony (...)" </Dd> </Dl> </Dd> <Dl> <Dd> "Every person who shall monopolize, or attempt to monopolize, or combine or conspire with any other person or persons, to monopolize any part of the trade or commerce among the several States, or with foreign nations, shall be deemed guilty of a felony (...)" </Dd> </Dl> <Dd> "Every person who shall monopolize, or attempt to monopolize, or combine or conspire with any other person or persons, to monopolize any part of the trade or commerce among the several States, or with foreign nations, shall be deemed guilty of a felony (...)" </Dd> <P> The Clayton Antitrust Act, passed in 1914, prescribes certain additional activities that had been discovered to fall outside the scope of the Sherman Antitrust Act . For example, the Clayton Act added certain practices to the list of impermissible activities: </P>

Which of the following was declared illegal by the sherman act of 1890