Consider Clock Based on a Simple Pendulum That Is Outdoors

Consider clock based on a simple pendulum that is outdoors in Helsinki,Finland.The pendulum consists of a mass of 1.00 kg that is hanging from a thin 3.000-m long aluminum rod.The clock is calibrated perfectly during a summer day with the average temperature of 25^oC.During a winter day the clock measures the 24-hour period as 24 hours and 30 seconds.What is the average temperature on this day?

A) 9.1^oC
B) -15^oC
C) -25^oC
D) -6.6^oC
E) -10^oC