PLZ HELP ME ILL GIVE 20 POINTS AND BRAINLIEST!!! :'(
I am so desperate.

the answers the correct one is C

Explanation:

In radioactive decay processes, a very important concept is the half-life time, which is the time it takes for the parent nuclei to decompose into child nuclei.

expressed this mathematically is

              N = N₀

for the average life time

              N₀ / 2 = N₀  

               T =

Analyzing this expression, the nuclei that decay are the so-called parents and the new nuclei called children appear.

when checking the answers the correct one is C

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle