The development of cars has pros and cons. the car has allowed for better transportation, but it is also responsible for a great deal of pollution. which activity solve the pollution problem through the use of new technology?

a. building fewer cars
b. encouraging people to ride a bus
c. building cars that run on non-polluting fuels
d. encouraging people to walk more

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a researcher conducts a comparison of the comments made in a publicly available blog and the blogger's comments on a similar topic in a weekly magazine. undergraduate students in a field methods class are assigned a research question and asked to interview another classmate, to be followed by a class discussion on interview techniques. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. a researcher sets up a meeting with the superintendent of a large and diverse public school system to get data about the ethnic composition of the school system and the number of students receiving free lunches.