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ADS-B (Automatic Dependent Surveillance — Broadcast) Out is required for VFR aircraft operating in

Choices

all US airspace.
Not required in remote/uncontrolled airspace.
✓ Class A, B, C, and Class E airspace at and above 10,000 ft MSL.correct
excluding airspace at and below 2,500 ft AGL). within Mode C veils around Class B airports; and over the Gulf of Mexico above 3,000 ft MSL within 12 nm of US coastline. 14 CFR 91.225 ADS-B Out rule: required in airspace where Mode C transponder is required, plus Gulf of Mexico over 3,000 ft within 12 nm of coast. ADS-B In is OPTIONAL but provides traffic and weather (FIS-B). Equipping with ADS-B Out is mandatory for IFR and most VFR ops in or above busy airspace.
only Class A airspace.
Class A is just one of several requirement zones.
only commercial flights.
ADS-B applies to GA too, not only commercial.

Why

excluding airspace at and below 2,500 ft AGL). within Mode C veils around Class B airports; and over the Gulf of Mexico above 3,000 ft MSL within 12 nm of US coastline. 14 CFR 91.225 ADS-B Out rule: required in airspace where Mode C transponder is required, plus Gulf of Mexico over 3,000 ft within 12 nm of coast. ADS-B In is OPTIONAL but provides traffic and weather (FIS-B). Equipping with ADS-B Out is mandatory for IFR and most VFR ops in or above busy airspace.

FAA source: 14 CFR §91.225(d), ADS-B Out required airspacebrowse the reference library →

Covered in Supplemental · I — Preflight Preparation — study the lessons free, then practice with grading and mastery tracking.

Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.