Who Said it? Tzitzis on Display

Who wrote the following?
(translation is mine)

The Main (Iqqar) mitzva of Tallith Qatan is to wear it ON one's clothes in order to always wear it and remember the Mitzvos

A) Rambam
B) SA Harav
C) SA of R Y Caro
D) Mishnah Brura
E) None of the above

KT
RRW