$9.$ Find out if the statement is true or false: Alkylation in petroleum refining combines smaller hydrocarbon molecules like isobutane with olefins to produce larger, more complex molecules that contribute to the high octane rating of gasoline.

Answer: A$.$ True

B$.$ False

C$.$ Not enough information

D$.$ None of the above

$10.$ Find out if the statement is true or false: Polymerization in the refining process is primarily used for creating plastics and synthetic rubber by combining propylene or butylene molecules into longer chains.

Answer: A$.$ True

B$.$ False

C$.$ Not enough information

D$.$ None of the above