Drill 1: Core 107 limits
Without a waiver, which set of limits is correct for a small UA under Part 107?
Answer: C. §107.51: max groundspeed 87 knots (100 mph). Max altitude 400 ft AGL, unless flown within a 400 ft radius of a structure and no higher than 400 ft above its top. Min flight visibility 3 SM from the control station. Stay at least 500 ft below and 2,000 ft horizontally from clouds. These limits apply in every airspace class unless waived.
Source: 14 CFR §107.51(a)–(d)