Find the missing letter. – The question contains a table which is not

Find the missing letter.
– The question contains a table which is not rendered here.

A
D
O
N
This question was previously asked in
UPSC CISF-AC-EXE – 2018
The question refers to a missing table which is essential to identify the pattern and find the missing letter. Without the table or the context of the pattern, it is impossible to determine the correct answer from the given options. Therefore, a definitive correct option cannot be provided based solely on the text of the question.
Questions involving missing letters or numbers typically require identifying a sequence, pattern, or relationship within a given set of data, often presented in a table, matrix, series, or diagram. The pattern could be based on alphabetical position, arithmetic operations, visual arrangement, or a combination thereof.
To solve such problems, one would need to carefully observe the provided data (the table, in this case) and test potential patterns (e.g., row-wise, column-wise, diagonal, sum, difference, product, letter values, etc.) to find the rule governing the arrangement. Once the rule is found, it is applied to determine the missing element. As the table is unavailable, this step cannot be performed.