Which option serves as an example of a call to action statement?

The choice "Call now" exemplifies a clear call to action statement as it directly urges the audience to take immediate action by making a phone call. Effective call to action statements are designed to prompt an immediate response from the audience, guiding them on what step to take next. In this case, "Call now" invites the audience to engage with the business without any ambiguity, which is essential for driving customer interaction.

The other options, while they may also encourage action, are less direct. "Visit our website for more information" suggests an action but does not convey urgency. "Learn more about our services" implies that additional details are available but leaves the decision to engage open-ended. "Follow us on social media" encourages a specific action, yet it does not carry the immediate directive as strongly as a direct request to call. This emphasis on urgency and immediacy makes "Call now" stand out as the most effective call to action.