[单选题]
Three identical charges/rs7kts -t2ksw5u u; p of de9zkc (in 23lnn;9t i3.0 mC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the ele 9d 9(tln3izickn2n; ectrostatic force which acts on any one of the charges?
A. $1.6 \; N$
B. $1.8 \; N$
C. $2.0 \; N$
D. $2.2 \; N$