Editorialist: In a large corporation, one of the functions of the corporation's president is to promote the key interests of the shareholders.
Evidence
In a large corporation, one of the KIS → PD functions of the corporation's president is to promote the key interests of the shareholders.
Conclusion
The president has a duty to keep P → PD the corporation's profits high.
Evaluate
The argument assumes that P → KIS keeping the corporation’s profits high is a key interest of the shareholders.