Based on this sentence "The 8th-, 10th-, and 12th-grade surveys each involved separate and non-overlapping school samples (about 130-160 schools each), drawn to be representative of all students in the 48 contiguous states" the sampling method most likely involves a combination of Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a cluster and stratified sampling b cluster sampling and SRS c stratified sampling and SRS d SRS and systematic sampling