Discussion
Which material is a filter substrate commonly made from?
Answer: C
Cordierite is cheaper and silicon carbide tolerates higher temperatures. The last option explains exactly that choice, which makes it a correct and more instructive version. Metal foam filters exist but are uncommon. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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