Direction: Study the following information carefully and answer the given questions. In a certain code language:
'weather was bad' is written as 'rz ku st'
'it was raining' is written as ' et wp ku'
'raining very heavily' is written as 'uk vn wp'
'weather was balmy' is written as 'ku rz ap'
What is the code for 'weather'?

Options

A. st
B. rz
C. ku
D. op