Carl Plants a Bomb in a Public Library in Order

Carl plants a bomb in a public library in order to protest about redundancies. He alerts the library manager about the bomb 15 minutes before it explodes. Carl knows that there is a chance that somebody working in the basement might not be evacuated in time, but he thinks that this is unlikely. Which of the following terms best represents Carl's mens rea in respect of harming any person?

A) Indirect intent
B) Subjectively reckless
C) Direct intent
D) Objectively reckless