During the Postwar Boom, Commercial Banks Were Subject to Interest

During the postwar boom, commercial banks were subject to interest rate ceilings under Regulation Q. Which of these is true of thrifts regarding Regulation Q?

A) Thrifts were initially unaffected by Regulation Q but subjected to the same regulations as commercial banks by 1950.
B) Thrifts were not affected by Regulation Q during the postwar boom.
C) Thrifts were allowed to provide slightly higher interest on deposits than commercial banks under Regulation Q.
D) Thrifts were limited to even lower interest rates for depositors than commercial banks could pay under Regulation Q.