The correct option is main is the base branch and feature-auth is the compare branch.

In GitHub a pull request targets a base branch that will receive the changes and compares a source branch that contains the commits. You want to merge work from feature-auth into main so main must be the base and feature-auth must be the compare.

develop is the base branch and feature-auth is the compare branch is wrong because the scenario specifies merging into main and the base must be the destination branch not develop.

main is the base branch and main is the compare branch is wrong because comparing a branch to itself produces no changes and it ignores the feature-auth branch stated in the scenario.

feature-auth is the base branch and main is the compare branch is wrong because it reverses the direction of the merge since the base should be the target and the compare should be the source.

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