If R, T, E, N, Then
Y
Explanation for correct option:
Add the first pattern and write it's number name.
, which is written as FOUR. The last letter is R.
Perform the same operation for other patterns as well.
, which is written as EIGHT. The last letter is T.
, which is written as TWELVE. The last letter is E.
, which is written as SIXTEEN. The last letter is N.
Similarly,
, which is written as TWENTY. The last letter is Y.
Therefore, option A is correct.