---I'll be away on a business trip .Would you mind looking after my cat?

---Not at all.____________. 

A．I've no time

B．I'd rather not

C．I'd like

D．I'd be happy to

放射碘治疗的机制是¹³¹I被甲状腺摄取后释放出α射线破坏甲状腺组织。