Which of the Following Could We Infer from Sinnott-Armstrong's Argument

Multiple Choice

Which of the following could we infer from Sinnott-Armstrong's argument that the greenhouse gas emissions from a single joyride will not cause anyone any harm?

A) It is sometimes possible for a large number of actions to cause great harm although none of the individual actions causes any harm.
B) Whenever a large number of actions, taken together, cause great harm, it must be because at least some of those actions cause at least some harm.
C) Because individual's greenhouse gas emissions do not cause any harm, global warming as a whole will not cause significant harm.
D) When we cannot be sure whether an action will cause harm, that is morally equivalent to saying that the action will not cause harm.