The correct option is C 164 N/m
As we know,
Liquid drop has only one layer.
∴ Work done in formation of liquid drop;
W=4πT(r2f−r2i)
where,
Surface tension of liquid is T
Final radius of liquid drop,rf=5×10−2 m
Initial radius of liquid drop,ri=3×10−2 m
⇒4π×T×(0.052−0.032)=π×10−4 J
⇒T=164 N/m