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To enforce a pull request merge strategy that consolidates commit histories into a single commit, selecting the squash merge option is appropriate.

When you use a squash merge, Git takes all the changes in the pull request and "squashes" them into a single commit that is then added to the target branch. This results in a cleaner project history, as it avoids cluttering the branch with multiple commits that may represent small incremental changes or fixes. Instead, it creates one cohesive commit that summarizes all the changes made in the pull request, making it easier for other team members to read the project's history.

The squash merge strategy is particularly useful in scenarios where it's important to maintain a linear and streamlined commit history. It allows teams to keep their main branch (like main or master) tidy, focusing on high-level changes rather than the detailed evolution of features.

Other choices, such as fast-forward merge and no-fast-forward merge, maintain all individual commit histories, which does not align with the desire to consolidate changes into a single commit. Git fetch is a command used to retrieve the latest changes from a remote repository but does not pertain to the merging process or strategies. Thus, the squash merge is the best choice for consolidating commit histories into one single commit