Marketo's Munchkin code is a JavaScript snippet placed on a website to track user interactions. Its fundamental, out-of-the-box behavior is to log a "Visit Web Page" activity every time a page containing the code is loaded by a user. Additionally, the Munchkin JavaScript API provides developers with the ability to explicitly track link clicks. By invoking the clickLink function, a "Clicked Link on Web Page" activity is recorded in the lead's activity log. These two behaviors—page visits and link clicks—are the core web activities that Munchkin is designed to track.

C. Social media activity: Munchkin tracks activity on your web properties. It cannot track actions a user takes directly on third-party social media sites.

D. Web page bookmarks: Bookmarking is a browser-level function. Client-side JavaScript like Munchkin does not have access to this browser action and cannot track it.

E. Average time spent on site: This is a calculated metric derived from the timestamps of multiple page visits. Munchkin tracks the discrete visit events, not the duration between them.

1. Adobe Experience League, Marketo Engage Documentation, "Understanding Munchkin." This document explicitly states, "Munchkin is Marketo’s custom JavaScript for tracking person activity on your website. It is required to track 'Visits Web Page' and 'Clicks Link on Web Page' activities..." This directly confirms that web page visits and clicks are the primary trackable behaviors.

2. Adobe Experience League, Marketo Engage Documentation, "Munchkin Javascript API." Under the "Supported Methods" section, the clickLink method is detailed. The documentation states, "Use this method to track a link click for a known or anonymous person." This confirms the capability to track web page clicks.

3. Adobe Experience League, Marketo Engage Documentation, "Web Page Activity Tracking." This article describes the types of web activities logged by Marketo. It lists "Visit Web Page" as the activity logged when a person visits a page with the tracking code and "Clicked Link" as the activity for when a person clicks a tracked link, reinforcing that these are the specific behaviors captured.