Correct Option: C

Let frequency be ω .

∴ z = jωL +	R
	1 + jωRC

z = j 0.1 ω +	1	×	1 - jω
	1 + jω		1 - jω

= j0.1ω +	1 - jω
	1 + ω2

=	1	+ j		0.1 ω -	ω
	1 + ω2				1 + ω2

For resonance, imaginary part must be zero.

∴ 0.1 -	ω	= 0
	1 + ω2

or 0.1 =	1
	1 + ω2

or 1 + ω² = 10
or ω² = 9
ω = 3 rad/sec