Final answer:
A Teacher of the gifted and talented is best equipped to assist with the educational needs of a student displaying advanced mastery of content, by providing enriched and accelerated learning opportunities.
Step-by-step explanation:
The school personnel best suited to help a general education teacher meet the needs of a student showing an advanced understanding and mastery of grade-level content and objectives is A. Teacher of the gifted and talented. Gifted and talented teachers are specifically trained to provide enriched and accelerated learning experiences to students who demonstrate exceptional academic abilities and potential. They can offer specialized curriculum and instructional strategies that go beyond the standard classroom content, thus ensuring that gifted students remain engaged and challenged.