The correct answer is C. To revise curriculum.
A curriculum is a set of courses and programs that are offered by a school or university. It is important to revise the curriculum regularly to ensure that it is up-to-date and relevant to the needs of students. A revised curriculum can help to raise the standard of education by providing students with a more challenging and engaging learning experience.
Option A is incorrect because evaluating students continuously does not necessarily lead to a higher standard of education. In fact, if students are constantly being evaluated, they may become stressed and anxious, which can negatively impact their learning.
Option B is incorrect because giving high salaries to teachers does not guarantee that they will be effective educators. There are many other factors that contribute to effective teaching, such as teacher training, classroom management skills, and subject matter knowledge.
Option D is incorrect because making good school buildings does not necessarily lead to a higher standard of education. In fact, some of the best schools in the world are located in very humble buildings. What matters most is the quality of teaching and learning that takes place inside the school building.
In conclusion, the correct answer to the question “To raise the standard of education, it is necessary” is C. To revise curriculum.