$43.$ In the context of crude oil processing, the term "light ends" refers to:

$-$ A$)$ Fractions with high boiling points

$-$ B$)$ The lightest color fractions

$-$ C$)$ Fractions with low boiling points

$-$ D$)$ The most viscous fractions

$44.$ What role does the catalytic reformer play in a refinery?

A$)$ It removes impurities from crude oil

B$)$ It converts heavy fractions into lighter, more valuable products

C$)$ It increases the octane rating of gasoline

D$)$ It reduces the sulfur content of diesel