Which of the following materials is considered the most fire-resistant?a) Woodb) Steelc) Concreted) Glass

The most fire-resistant material among the options given is c) Concrete.

Here's why:

a) Wood: Wood is organic and combustible, meaning it can easily catch fire and burn.

b) Steel: While steel has a higher melting point than wood, it can weaken and melt when exposed to high temperatures for a prolonged period.

c) Concrete: Concrete is highly fire-resistant because it is non-combustible and has low thermal conductivity, meaning it does not easily transfer heat. It can withstand high temperatures for longer periods without losing its structural integrity.

d) Glass: Glass can withstand heat to a certain extent, but it can crack or even melt when exposed to very high temperatures.

Therefore, concrete is the most fire-resistant material among the ones listed.