What is the advantage of the spiral curriculum on which all Indian language text books are based? Pick the option that best answers the question. Ideas and concepts are:

Correct option is C

graded and continuous but allows revisiting when needed
The advantage of the spiral curriculum is that it is graded and continuous, allowing for a progressive increase in the complexity of content. However, it also permits revisiting previous concepts when needed, reinforcing learning and understanding. This approach is beneficial in language learning as it allows students to build on their knowledge while also revisiting and strengthening their understanding of earlier concepts.