Which of the Following Was Not Among the Steps Taken

Which of the following was not among the steps taken by Exxon to spread doubt about climate change?

A) Funding nonprofits that called climate change into question.
B) Making campaign contributions to those who felt climate science was too uncertain to affect policy.
C) Hiring lobbyists to convince policy makers that climate change was uncertain.
D) Funding an in-house research team to produce unbiased analysis of the effects of carbon dioxide on the atmosphere.