What type of writing is this? Is this for writing an essay? If that is so, there are many video tutorials on YouTube that you can gain knowledge from. Try clicking those with many views, and likes, and comments. You can usually discern the significance of a video that you clicked by looking at the comments below the video.
I believe the correct sentence is “The cat sits on the carpet.”
The idea seems to be that there is always a rational explanation; the evidence just might not always be easily observable. But the first step towards finding that evidence is to prize the power of the rational mind, and refuse to consider irrational possibilities
B! In A, there is a comma missing, In C there is a comma missing, and in D there is an extra comma