The answer is "ทุกข้อเป็นองค์ประกอบ" which means "All options are components." This is because the question asks for the definition of "องค์ประกอบของ สื่อประสม" which translates to "Components of multimedia." The given options include text, still images, graphics, charts, graphs, videos, and sound, all of which are components of multimedia.