Answer
The act that prohibits conspiring with competitors to fix prices is Sherman Act ,option A as found in the attached
Step-by-step explanation:
The Sherman Antitrust Act was enacted in the year in 1890 prevent cases relating to collusion of business rivals coming together to dictate prices by price fixing.The Act was named after John Sherman, the main compiler of the Act.
While Robinson-Patman Act of 1936 was passed to prohibit all forms of price discriminations. Price discrimination is a selling strategy where the same item is sold at different groups of consumers.
In other words,price discrimination is a form extortion that should not be left to operate in a free market economy where forces of demand and supply determine the volumes of transaction and prices.