Why Does the Temporal Lag in the Effects of Carbon

Why does the temporal lag in the effects of carbon dioxide emissions make it hard for us to respond to climate change, according to Krakoff?

A) Because humans are inherently selfish, we are not motivated to take actions that will mostly benefit people who live in the distant future.
B) Since climate change results from everyone's carbon dioxide emissions anywhere in the world, no individual person has a strong reason to reduce his or her own emissions.
C) The temporal lag means that we cannot observe the effects of our emissions and so we have no way of knowing whether our emissions really will harm people in the future.
D) The temporal lag makes it hard for us to perceive the problem and forces us to respond to the problem based on predictions of future effects rather than direct observation of those effects.