To muster means to:

The term "muster" refers to the act of gathering or bringing together, particularly in the context of assembling people or troops, often for inspection or preparation for service. This meaning emphasizes the action of coming together for a specific purpose, which aligns perfectly with the correct answer.

In various contexts, such as military or organizational scenarios, "muster" can involve collecting individuals to form a group, readying them for action, or convening them to review collective readiness. The understanding of "muster" in this way highlights the collaborative aspect of the term.

The other options, while they describe different actions, do not capture the essence of "muster." They involve executing plans, dividing things, or critiquing, which take the focus away from the gathering concept that is central to the word "muster."