How is this question rated the same level of difficulty as the last lol

The stimulus says “Government is the exclusive source of funding for most genetic research.” Is that not reason enough to think B is the correct answer? I now see how D is correct but I also don’t see how B is wrong as well.

For AC B, isn’t the “Diverse psychological symptoms” mentioned in the AC referring to the symptoms of being “depressed, drowsy, or even irritable.”? Thats the reason why I personally choice B, the stimulus explicitly mentions that symptoms usually follow.