Suppose The annual science fair at the local elementary school is coming up, and students are hard at work on their projects. Topics range from robotics to environmental conservation, and many children are experimenting with hands-on activities like building model volcanoes and investigating the properties of magnets. The fair will feature judging by local scientists and engineers, with prizes awarded for creativity and scientific accuracy.
Can we infer that "Only children from one grade are participating in the science fair."? Yes, no, or maybe?