A mercury thermometer was first placed in melting ice and the length of mercury column was observed to be 10 mm; when it was placed in steam, the length of the column was
250 mm. Whenplaced in tap water, the length of the column was 58 mm. The temperature of the tap water is

A

$$24.2^\circ C$$

B

$$20^\circ C$$

C

$$38.4^\circ C$$

D

$$4.14^\circ C$$