[单选题]
What is the magnetic moment of a rectangular loop o l6qw( 3heui gmq,ox,2u/izl 7jjna3/f 120 tur tj+p.-seitt0ns that carries 6.0 A if its dimensions are 4.0 cm x 8.j -.+ti stet0p0 cm?
A. $0.23 \; A \cdot m^{2}$
B. $2.3 \; A \cdot m^{2}$
C. $23 \; A \cdot m^{2}$
D. $230 \; A \cdot m^{2}$
