Natural rubber is not used in making footwear for polar regions because

Options

A. natura rubber becomes soft at temperature lower than `10^(@)C`
B. nature rubber becomes brittle at temperature lower than `10^(@)C`
C. natural rubber melts at temperature lower than `10^(@)C`
D. natural rubber becomes stronger at temperature lower than `10^(@)C`

Answer

B

Explanation

It becomes soft at high temperature (335K) and brittle at low temperature (`lt283`), so it is not used in making footwear for polar regions.