Which of the following best describes a key benefit of using Smart Campaigns?

Smart Campaigns are a fundamental feature of Marketo that enhance marketing automation by allowing users to create customized marketing actions based on specific triggers and conditions. The ability to send targeted content based on lead interactions is a key benefit because it ensures that communication is relevant and personalized. This is critical in nurturing leads and improving engagement, as it allows marketers to serve content tailored to the specific interests and actions of each lead, thereby increasing the likelihood of conversion.

In contrast, while Smart Campaigns can interact with lead scoring mechanisms, their primary function isn't centered around the automation of lead scoring processes. Complex sales forecasts may require additional tools and data analysis, which is outside the scope of what Smart Campaigns are designed to do. The design of landing pages, although important, is typically managed through other Marketo features rather than being a direct capability of Smart Campaigns. Thus, the focus of Smart Campaigns on delivering targeted content based on lead behavior is what makes the option correct.