Answer:
A. Seriation
Step-by-step explanation:
Seriation -
It refers to the problematic situation , where there is problem in ordering some objects is observed , is referred to as seriation .
The sequence or the ranking is lost , and the person is not able to arrange the article or numbers .
Hence , from the given scenario of the question ,
The child is facing problem with Seriation , as he is not able to place the digits in their correct position .
Hence , from the given scenario of the question ,
The correct answer is A. Seriation .