Correct option is C
The answer is (c) The child has not fully understood the place value system.
The student's error in writing "4002" instead of "402" and "6008" instead of "608" indicates a lack of understanding of the place value system. In the place value system, the digits in a number represent different quantities based on their position. The student is treating each digit as an independent entity rather than understanding its value in relation to its position. This suggests a need for further instruction and practice in comprehending the place value concept.
