Answer: D. Many studies point to the same conclusions
Step-by-step explanation:
Option a is incorrect because if studies fail to come to a conclusion, then they wouldn't validate climate change.
Option b is incorrect because opinions aren't facts and are therefore unaccepted as valid answers to any topic.
Option c is incorrect because made up studies would prove false and therefore become an invalid reasoning for climate change.
Option d is correct because if studies are done multiple times and come out to the same conclusion, it suggests that the topic (climate change) is real and valid.
Hope this helps!