Why are metalloids often used in electronics?

Metalloids show the properties that are midway between metals and non metals. silicon is a metalloid and for this reason it is abundantly used in computer chip industry. silicon and other metalloid elements are building blocks of electronics because they are cheap, easily available, economical. 

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.