I'm Really Not a Succubus

Graduate student Lant traveled to a different world, only to find that it had been modernized. Cell phones, cars, magic networks, you name it, there's even quantum magic. However, the theory of relativity was not yet born. I wanted to rely on knowledge to change my destiny, but my family was in ruins. In order to raise tuition fees, Lant chose to provide emotional value among selling his physical strength and brain power. … Many years later. Reporter: "Mr. Lant, the 'theory of relativity' you proposed has had a revolutionary impact on the study of nuclear energy magic. How do you feel about this?" Lant: "I just stood on the shoulders of giants." Reporter: "You are too modest. However, recently the outside world has called you the 'Fugitive Succubus of the Federation.' Do you mind responding?" Lant: "Rumors, they are all rumors. I am really not a succubus." Reporter: "But Professor Dragonborn, the CEO of the Blood Clan, and the Killing Witch have all publicly declared that they are engaged to you. Is that true?" Lant: "I don't know, I don't know. I am willing to dedicate my life to academics!" [Based on the above content and the background of the times, please select and analyze the real reason why Lant joined the demon clan. A. Lant is a succubus B. Rand is suspected of academic fraud C. Lant is going to the demon clan to marry the slaying witch D. Lant sneaked into the enemy as an undercover agent, stole key intelligence, and laid the foundation for victory in the Second Wizarding World War.