All of the options provided can be considered elements that contribute to drama, but if you're looking for a specific dramatic element commonly discussed in theatre, "tension" is often highlighted as a key dramatic element. However, "monologue" is also a significant dramatic component as it relates to character development and storytelling.
So, if you need to pick one, you might choose:
tension
However, keep in mind that both "tension" and "monologue" are valid responses depending on the context of the question.