The eighth-grade students at shady oak school took a poll about their afterschool activities. the study concluded that 75% of the eighth-grade students at the school currently take part in at least two afterschool activities, which is not a valid generalization. which sample could have led the researcher to make the invalid generalization?

every other eighth-grade student who was issued a report card during the fall semester

an equal number of eighth-grade boys and girls picked randomly from the school directory

an equal number of eighth-grade students chosen by chance from the athletic teams and school clubs

every third student who enters any eighth-grade class at a particular hour of the day