Final answer:
Attending a trade show to gather information about a competitor's products is a legal and ethical competitive intelligence practice.
Step-by-step explanation:
b. An executive attends a trade show solely to obtain a competitor's brochures, listen to sales pitches, and ask questions about the competitor's products.
Out of the provided options, attending a trade show and gathering information about a competitor's products is a legal and ethical competitive intelligence practice. Trade shows are public events where companies showcase their products and services, and it is common for executives to attend to gather market insights and learn about the competition. As long as the executive does not engage in any illegal or unethical practices, such as stealing confidential information or misrepresenting themselves, attending a trade show for competitive intelligence is a legitimate strategy.