Final answer:
Option 2) Caulfield is writing about using the control-f function as a way to help people verify and resist online misinformation.
Step-by-step explanation:
The sentence written by Susan effectively summarizes Mike Caulfield's article about the danger of online misinformation. From Susan's sentence, we can infer that Caulfield is writing about using the control-f function as a way to help people verify and resist online misinformation. Therefore, the correct answer is option 2) Caulfield is writing about using the control-f function as a way to help people verify and resist online misinformation.