Essayist: The way science is conducted and regulated can be changed. But we need to determine whether the changes are warranted, taking into account their price. The use of animals in research could end immediately, but only at the cost of abandoning many kinds of research and making others very expensive. The use of recombinant DNA could be drastically curtailed. Many other restrictions could be imposed, complete with a system of fraud police. But such massive interventions would be costly and would change the character of science. Which one of the following most accurately expresses the main conclusion of the essayist's argument? ['If we regulate science more closely, we will change the character of science.', 'The regulation of science and the conducting of science can be changed.', 'We should not make changes that will alter the character of science.', 'We need to be aware of the impact of change in science before changes are made.']