A boosted post is a simplified form of advertising on Facebook designed to amplify the reach of an existing post from a business Page. Its primary and most direct objective is to increase user engagement, which includes actions like reactions (likes), comments, and shares. While boosting can drive traffic to a website, its core function and simplified interface are optimized for getting more people to see and interact with the Page's content itself, rather than tracking complex off-platform conversions.

A. Review actions on the business website: This requires the Meta Pixel and is a feature of more complex campaigns set up in Ads Manager, not the primary goal of a simple boost.

B. Measure the number of purchases on the business website: This is a specific conversion objective that necessitates advanced setup with the Meta Pixel and is managed through Ads Manager for accurate tracking.

C. Have their message appear on the top of people's news feeds: Ad placement is determined by a competitive auction system and user relevance; boosting increases visibility but does not guarantee a top-of-feed position.

E. Obtain in-depth reporting that includes cost per purchase: This level of detailed, conversion-focused reporting is a feature of the Ads Manager platform, not the simplified analytics provided for a boosted post.

1. Meta Business Help Center. "About boosted posts on Facebook." This official documentation states, "When you boost a post, it'll appear in your audience's Facebook Feed as an ad. You can also select Instagram as an ad placement for your boosted post. ... Boosting a post can help you get more people to react, share and comment on it." This directly supports that the primary goal is to increase engagement.

2. Meta Business Help Center. "Differences between boosted posts and Facebook ads created in Ads Manager." This source clarifies the limitations of boosted posts compared to full campaigns. It notes that Ads Manager is required for more advanced objectives like "Website conversions" and provides more comprehensive reporting, which invalidates options A, B, and E as primary functions of a boost.

3. Meta Business Help Center. "About ad auctions." This document explains how ad delivery works: "For each ad impression, our ad auction system selects the best ad to run based on the ads’ maximum bids and ad performance." This confirms that placement is not guaranteed, refuting option C.