A group of students designed a study which restaurant was preferred by teenagers. To gather data, the students planned to visit a number of restaurants and keep a tally of how many teenagers were at each restaurant. Q. Which type of research design does the study use? A. Sample survey B. Stratified survey C. Experimental survey D. Observational survey PLS HELP I WILL GIVE BRAINLIEST AND 50 POINTS

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit