Answer: d) "I wonder who funded this study?"
Explanation: Critical thinking involves the inclusion of analyzing the subject and then evaluating it to form a result or judgement on basis of that.The news mentioned in the question about" pesticide is not a harmful chemical for human"will lead to critical thinking of firstly questioning about the financial source of this news.
This questioning is displaying the analyzation of the news to evaluate and conclude to some result. Other options are incorrect because they are indicating about the usage or though of using the pesticide without evaluation based on any factor such as source, financial funding,etc.Thus, the correct option is option(d).