The answer is B: Thirty-seven people were executed in the state of Texas from 1970 to 1979.
When making a claim or an argument based on information that is not common knowledge and that aspires to certainty, one should include a citation so that others can review the claim by going to the source to verify and corroborate the information. If the information is checked in that manner with a positive outcome, one could claim that the source is reliable and the information pertinent.