Which statement accurately describes the general entry requirements for Class B vs Class C airspace?

• A. Class B requires ATC clearance to enter, two-way radio communications, and a functioning Mode C transponder; Class C requires two-way radio communications and a Mode C transponder (entry typically acknowledged by ATC).
• B. Class B requires two-way communications only; Class C requires ATC clearance.
• C. Both require ATC clearance and Mode C; two-way radio is optional.
• D. Class B and C require no communications but require a transponder.

Answer: (A)

Entry into Class B airspace is tightly controlled: you must have explicit ATC clearance before you enter, and you need two-way radio communication with ATC, plus a functioning Mode C transponder. This reflects how Class B surrounds busy airports and requires precise ATC authorization to manage the high traffic.

For Class C airspace, the requirement is different but related: you must establish two-way radio communication with ATC before or as you enter, and you must have a Mode C transponder. ATC will typically acknowledge your contact and assign a radar code; you’ll then follow their instructions while you remain in touch with them. There isn’t a blanket clearance to enter the airspace as there is with Class B, but you do need to be in continuous communication.

The other options don’t fit because they either omit the need for explicit clearance in Class B, or they suggest two-way communications are optional or nonexistent, which isn’t correct for these airspace classes.