Answer the following question: Fact 1: Hydrogen bonds cause water to expand when it freezes. Fact 2: Water is everywhere H20. Given the two facts above, hydrogen bonds cause what to expand when it freezes?

OPTIONS:
a). salt;
b). mercury;
c). NaCl;
d). lake;
e). H20;
f). rain;
g). h2o;
h). oxygen;
Answer:
e).