Consider the Assertion and Reason given below.
Assertion $(A):$ Ethene polymerized in the presence of Ziegler-Natta catalyst at high temperature and pressure is used to make buckets and dustbins.
Reason $(R):$ High density polymers are closely packed and are chemically inert.
Choose the correct answer from the following:

• A
  $(A)$ is correct but $(R)$ is wrong.
• B
  $(A)$ and $(R)$ both are wrong.
• C
  Both $(A)$ and $(R)$ are correct and $(R)$ is the correct explanation of $(A).$
• D
  Both $(A)$ and $(R)$ are correct but $(R)$ is not the correct explanation of $(A).$