Which of the following characters is acceptable to use in a filename

You never stated the possible answer choices to your answer, but usually in a filename you can use all letters of the alphabet, but you cannot use any symbols. such as backslashes, percentage signs etc., but underscores you can use, since they can be used for spacing 2 seperate words.

Ithink the answer is d hope it

Answer the car to the left must yield the right of way to the vehicle on the right;