Answer: B. While some private agencies are working on sending humans to Mars, many experts believe that the barriers to such a voyage still remain high.
Explanation:
The relevant article is ''Are Humans Really Headed to Mars Anytime Soon?''.
The main idea is that there are several private agencies who believe that a colony can be established on Mars by 2030 such as Mars One and Space X which is owned by Elon Musk.
There are several experts however, who have encouraged caution because they say that the barriers to such a voyage are still quite high. These experts include aerospace consultant, Mary Dittmar and space policy specialist John Logsdon.
