Jack is running for city mayor. he stops the first 10 people on the street and asks them what their biggest concern for the city is. six of the people say higher taxes are their biggest concern. jack concludes that most people in the town think higher taxes are the biggest concern. jack's conclusion is

a) valid. jack asked enough people.
b) invalid. jack did not ask enough people.
c) incorrect. six of ten people is not a majority.
d) bias. jack does not want to raise taxes and is looking for support