Given below are one statement and one assumption:

Statement: Ashish wrote a second letter to his father after two months when he did not receive any reply of the first letter.

Assumption: (I) Ashish's father did not receive the letter.

(II) His father promptly sends reply to his letters.

Which Assumption is implicit on the basis of given statement ?

Only (II) is implicit

Ashish wrote the second letter to his father only when he did not receive the reply from his father. This fact implies that his father promptly sends reply to his letters.