 What likely happens to Val and Ron after the story ends?
The planet itself was tough enough—barren, desolate, forbidding; enough to stop the most adventurous and dedicated. Val's usually about the best wife a guy could ask for, but when she wants to be she can be a real flying bother. Nothing but what had stopped us could stop a sandcat: sand in the delicate mechanism of the atomic engine. When Val's tired and overwrought there's no sense in arguing with her. We knew the pay was poor, but we had felt it a sort of obligation, something we could do as individuals to keep the industries of radioactives-starved Earth going. The geiger kept up a fairly steady click-pattern, but never broke into that sudden explosive tumult that meant we had found pay-dirt. She slid down beside me, curled up, and in a moment she was fast asleep, sprawled out on the sands. Maybe we shouldn't have come to Mars after all. It's because we wanted to keep what we had. It had been spun on us only a short time ago, I realized. Val and I helped each other to our feet as best we could, considering our arms were still tightly bound against the sides of our oxysuits. Earth needed radioactives, and the only way to get them was to get out and look. The great atomic wars of the late 20th Century had used up much of the supply, but the amount used to blow up half the great cities of the world hardly compared with the amount we needed to put them back together again.
 They stay on Mars for their contract and then move on to a different project
 They stay on Mars for their contract and then move on to a different project  They go back to earth to make sure Ledman gets the care he needs  They decide to stay on Mars forever  They stay on Mars for a few more weeks before heading back to Earth