Final answer:
Chemical control of algal blooms includes the use of chlorine, copper sulfate, and other algaecides. All of these substances have properties that help manage and reduce algal growth in different aquatic environments.
Step-by-step explanation:
Chemical control of algal blooms can include the use of various substances, such as chlorine, copper sulfate, and other targeted algaecides. Chlorine is a potent oxidizer and has been used to control algal species like Caulerpa webbiana by being applied directly to the affected areas in controlled amounts. Copper sulfate is a common algicide, particularly in aquatic systems like swimming pools and fish tanks, due to its antimicrobial properties. Additionally, copper has been used in various applications to reduce microbial contamination due to its ability to inhibit microbial growth on surfaces. Thus, when considering the substances that can be utilized for the chemical control of algal blooms, the answer is D) All of the above.