question:  Why are Ri and Mia the guides?
context: Right up ahead of us. "We'll pitch camp right here, then," Extrone said. He crossed to Mia, who, along with him, had been pressed into Extrone's party as guides. Once more, Ri addressed the bearers, "Be quick, now!" "At least, then, I wouldn't be one of his guides. "You two scout ahead," Extrone said. "Yes, sir," Ri said, and instantly the two of them readjusted their shoulder straps and started off. Shortly they were inside of the scrub forest, safe from sight. And I don't think there's another cargo rocket on this planet outside of the one we leased from the Club. "Everybody and his brother had heard the rumor that farn beasts were somewhere around here. "After Extrone said he'd hunt farn beasts, even if it meant going to the alien system? I didn't tell Extrone, if that's what you're thinking," Mia said. It was a military craft, from the outpost on the near moon, and forward, near the nose, there was the blazoned emblem of the Ninth Fleet. Shortly, from the direction of the rocket, a group of four high-ranking officers came out of the forest, heading toward him. "You'll destroy this one, too," Extrone said. Extrone said, "To begin with, they probably don't even know I'm here. "That's why we'd like you to return to an inner planet, sir." Extrone plucked at his right ear lobe, half closing his eyes. The takeoff blast of the rocket illuminated the area, casting weird shadows on the gently swaying grasses; there was a hot breath of dry air and the rocket dwindled toward the stars. Extrone said, turning, startled. Hanging from the center, to the left of the slender, hand-carved center pole, was a chain of crystals.
output:  they have experience with the beasts
options:  they're part of Extrone's Hunting Club  they're the best guides around  they have experience with the beasts  they needed the money Extrone was going to pay them