A Uranium-238 nucleus, $^{238}_{92}\text{U}$, undergoes $\alpha$-emission to form a daughter product, which then undergoes $\beta$-emission to produce a grand-daughter product. What is the grand-daughter product?
- A$^{234}_{90}\text{Th}$
- B$^{234}_{91}\text{Pa}$
- C$^{234}_{92}\text{U}$
- D$^{230}_{90}\text{Th}$