Task analysis<span> is the analysis of how a task is accomplished, including a detailed description of bot manual and mental activities </span>
Have* this is because has* is past tense and have is more appropriate since there are multiple things you are referring too (Mercury, Venus, Earth and Mars). To be honest, these planets have a molten core.
I'm not sure since I can't read the passage, but I think D is least important.
They used their ability to focus & work together