Steady state stability of a power system is improved by
reducing fault clearing time
using double circuit line instead of single circuit line
by fast switching
decreasing generator inertia
using double circuit line instead of single circuit line
Steady state stability in power system is the capability of the system to return its steady state condition after subjected to certain disturbance or without affecting synchronism when subjected any disturbances.
Methods to improve steady
state stability :
at 
By reducing X (reactance) or
by raising 
or by increasing 
By use of double circuit line
instead of single circuit line.
Hence, the correct option is
(B).
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