Answer: b) as similar as possible
Explanation:
According to the question, Sam is judging the case between local corporation and national corp. He must include the evidence from cases that show similarity with the facts closely.Thus, he should find previous cases that resembles the case under consideration.
Other option are incorrect because difference , exactly same and odd factors are not to be included by Same as he must include the evidence that makes fact similar with the presently considered case.Thus, the correct option is option(b).