The answer is student.
A palette is a tool used by artists to mix paints. An easel is a stand used to hold a canvas or other surface for painting. A brush is a tool used to apply paint to a surface. A textbook is a book used in school to teach a subject. A lesson plan is a document that outlines the objectives, activities, and assessments for a lesson.
A student is a person who is learning or studying. In the context of the question, the words in the bottom row are related to the words in the top row in the sense that they are all tools or materials that are used in a particular activity. A palette is a tool used by artists to mix paints, an easel is a stand used to hold a canvas or other surface for painting, a brush is a tool used to apply paint to a surface, a textbook is a book used in school to teach a subject, and a lesson plan is a document that outlines the objectives, activities, and assessments for a lesson. A student is a person who is learning or studying, and in the context of the question, the word “student” is the most logical choice to complete the bottom row of words.
The other options are not as logical. An artist is a person who creates works of art, a teacher is a person who teaches others, a report card is a document that shows a student’s grades, and paint is a substance that is used to create works of art. While these words are all related to the topic of education, they are not as closely related to the words in the top row as the word “student” is.