Respuesta :
C. Offer a free blood–type testing camp in a school laboratory and collect data; this data would represent blood type groups in the entire population of California.
"Offer a free blood–type testing camp in a school laboratory and collect data; this data would represent blood type groups in the entire population of California" is the method that would be the best form of data collection. The correct option among all the options that are given in the question is the third option or option "C".