Exuse me, but I don't understand what you are saying. Are you referring to another question you posted? I really want to help you but I don't understand your question.
Do you have any ideas? :D
I am thinking A because b and c don't really express period of two weeks. It comes down to a or d. When you just talk or write you will most likely use a.
The second option is the answer because a ballad stanza is a four-line stanza in the iambic meter. the first and third lines have four metrical feet and do not rhyme. the second and fourth have three metrical feet and do rhyme