According to a recent study conducted by fire safety experts, on behalf of a major insurance provider, more than three times as many cooking fires occur due to the improper use of gas powered grills
than those that occur due to the incorrect handling of solid-fuel powered grills.
A) than those that occur
B) than are occurring
C) than to occur
D) as those occurring
E) as occur
Solution: The original underlined phrase is wrong as it misses the comparison marker 'as many as'.
This rules out options A, B and C.D) as those occurring
This option uses the correct comparison marker as many as those.
CORRECTE) as occur
This option is wrong because it doesn't use the relative pronoun 'those' here for making the comparison.
INCORRECTOption D is the right answer.