Answer: The age of a bone or other sample of organic matter by its carbon-14 content is 16252 years
Explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.


b) for completion of 14 % of reaction



The age of a bone or other sample of organic matter by its carbon-14 content is 16252 years
I believe the answer is C.
Hope this helps!
I would say B C and D but C explains why hydroelectric power has a specifically limited future
The type of conductors: aluminum, and copper