Consider the Following Processes (Treat All Gases as Ideal)

Multiple Choice

Consider the following processes (treat all gases as ideal) .
1.The pressure of 1 mol of oxygen gas is allowed to double isothermally.
2.Carbon dioxide is allowed to expand isothermally to 10 times its original volume.
3.The temperature of 1 mol of helium is increased 25°C at constant pressure.
4.Nitrogen gas is compressed isothermally to half its original volume.
5.A glass of water loses 100 J of energy reversibly at 30°C.
Which of these processes lead(s) to a decrease in entropy?

A) 1 and 2
B) 2
C) 3 and 4
D) 1,4,and 5
E) 1 and 3