Answer:
the correct answer is option c
Explanation:
the half-life of material 2 is 30 hours more than the half-life of material 1
that is, ∆the half-life of the material 2 > ∆the half-life of material 1 by 30 hours (I.e the time taken to deplete up to its half from 60 hours to 30 hours)
It's A because it shows reasons for doing the action.
Authors use evidence to support their claim all the time when they are trying to have the reader picture what they are claiming
The second choice is puncuted correctly.
