Plutonium !
and now i have to reach the word limit thing so ahh
A. because they turn opaque(white).
Answer:
Finally, that playing seriously with clay can be used in an investigative ... This view of agency is succinctly summarised by Barandiaran et al. ... irrespective of the nature of the agent, action is divided into cause and effect. ... The work of sculpting proceeds with a “feeling of and for clay”
Explanation: