A clock while keeps correct time at `30^(@)C` has a pendulum rod made of brass. The number of seconds it gains (or) looses per second when the temperature falls to `10^(@)C` is [`alpha` of brass `= 18 xx 10^(-6//@)C`]
A. `18 xx 10^(-6) sec`
B. `18 xx 10^(-5) sec`
C. `0.0018 sec`
D. `0.018 sec`