Which of these verbs means "to assemble or bring together"?

The verb that means "to assemble or bring together" is indeed "confero." This Latin term is derived from the combination of "con-" meaning together or with, and "fero," which means to carry or bring. Thus, "confero" conveys the idea of bringing things together or assembling a group.

In contrast, "vexo" means to vex or annoy, which does not relate to the concept of assembling. "Fero," while it means to carry or bear, lacks the additional nuance of coming together, and is thus broader in meaning. "Vocare," meaning to call, pertains to inviting or summoning but does not imply any action of gathering. Therefore, "confero" is the most accurate choice for "to assemble or bring together" as it captures the essence of collaboration and collection inherent in the definition.