Which of the Following Is Most Clearly an Explanation, Rather

Multiple Choice

Which of the following is most clearly an explanation, rather than an argument?

A) We should follow the path to the left, since it looks flatter and safer.
B) The kids are probably doing fine, since they are with a very competent babysitter.
C) Considering that the groundhog saw its shadow, there will be six more weeks of winter.
D) Because our guest room isn't prepared, you'll need to stay at the hotel.
E) The victim was probably killed somewhere else, because there is no blood at the crime scene.