I would say that the best is this one:
b. belief in a limited government that protects individual liberties
About the other options:
a- this is not really true, US is a federation so the government is not very centralized
c- no, this is controversial. Some people believe in the right to won handguns, but some don't.
The correct option is this one:
b. belief in a limited government that protects individual liberties - this is however true. The limited government allows for more economical freedom and the freedom of the states to decide over their internal affairs, which is something dear to Americans
