[单选题]
Light of wavelength 580 nm is in;s1jzhrpgi +fcl3 . 7qcident on a slit of width 0.300 mm. An ,2kdpy:.k r7nayrwdqy( 31pf observing screen is placed 2.00 m from the slit. Find the widt k271y(3p:,qyr rykpw.fdda nh of the central maximum.
A. $0.26 \; mm$
B. $1.9 \; mm$
C. $3.9 \; mm$
D. $7.7 \; mm$
