[单选题]
How much energy is nerqb1str8eu 93yi ;( iicessary to plg)s)qnpb ueib,r w+ apppe 9 t2/4g9h:ace three charges, each of 2.0 mC, at the corners of an equilateral tr9b9e)t)p/rp peqg b+agui: hn 4pws,2iangle of side 2.0 cm?
A. $4.5 \; J$
B. $5.4 \; J$
C. $6.7 \; J$
D. $7.6 \; J$
