$40.$ The depletion of oil reserves leads to an increase in:

A$)$ Oil production efficiency

B$)$ Oil prices

C$)$ The octane rating of gasoline

D$)$ The viscosity of crude oil

$41.$ Which type of cracking process uses high pressure and a catalyst to break down heavy hydrocarbon molecules?

A$)$ Thermal cracking

B$)$ Catalytic cracking

C$)$ Hydrocracking

D$)$ Steam cracking

$42.$ Sour crude oil contains high levels of:

A$)$ Methane

B$)$ Sulfur

C$)$ Nitrogen

D$)$ Oxygen

$43.$ The process that increases the branching of hydrocarbon chains to improve fuel quality is:

A$)$ Alkylation

B$)$ Isomerization

C$)$ Catalytic reforming

D$)$ Hydrocracking