Physics 9702 · AS & A Level · Atoms, nuclei and radiation

Atoms, nuclei and radiation — practice question

Thorium-234 ($^{234}_{90}\text{Th}$) undergoes $\beta^-$ emission to form a daughter product, which then undergoes another $\beta^-$ emission to produce a granddaughter product. Which letter in the diagram shows the granddaughter product?

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