What is the meaning of delirious as it is used in the following passage (paragraph 12)?

Pelayo threw a blanket over him and extended him the charity of letting him sleep in the shed, and only then did they notice that he had a temperature at night, and was delirious with the tongue twisters of an old Norwegian. That was one of the few times they became alarmed, for they thought he was going to die and not even the wise neighbor woman had been able to tell them what to do with dead angels.
Answer choices for the above question

A. In a state of extreme excitement

B. Characterized by irrational or unreasonable thoughts or speech

C. A mental disorder that negatively affects one’s ability to reason

D. To a great or large extent