While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be $$x$$ cm for the second resonance. Then

A

$$18 > x$$

B

$$x > 54$$

C

$$54 > x > 36$$

D

$$36 > x > 18$$