The soft drink company’s flat earnings for the second quarter
reflect the success of both its restructured global bottling system and the extent to which poor currency exchange rates keep down profits for multinational companies.
Option Elimination -
Bit of basics here
The "extent of" is used when discussing a degree of something without mentioning a criteria or a specific condition. For example, The report discussed the extent of environmental damage caused by the oil spill. Here, the report examined the degree or magnitude of the environmental damage.
The "extent to which" is used to discuss the degree to which something is true about a specific condition or criterion. It is typically followed by a clause or phrase that provides more information about the specific condition or criterion being evaluated.
For example, The study examined the extent to which technology influences students' learning outcomes. Here, the study analyzed the degree or level to which technology impacts learning outcomes.
(A) reflect the success of both its restructured global bottling system and the extent to which poor currency exchange rates keep - "the success" applies to both - its restricted global bottling system - ok. But saying "the success the extent to which poor currency exchange rates remain" is not okay. Wrong.
(B) reflect both the success of its restructured global bottling system and the extent to which poor currency exchange rates are keeping - ok. "the extent to which" is followed by a clause and establishes the right cause and effect relationship between "exchange rates" and "the profits." ok
(C) reflect both the success of its restructured global bottling system and the extent of poor currency exchange rates keeping -
Take this example to understand the issue better -
Incorrect: "The extent of heavy rainfall affecting the flooding is keeping the roads closed."
Correct: "The extent to which heavy rainfall is causing flooding is keeping the roads closed."
The correct version links the cause (heavy rainfall) to the effect (flooding), using "the extent to which" to indicate the degree or level of impact.
In option C, the cause and effect between "exchange rates" and "the profits" is not established without "are." Without "are," keeping is just an ING verbal modifying rate.
(D) both reflect the success of its restructured global bottling system and to what extent poor currency exchange rates are keeping - Wrong as the verb "reflects" doesn't apply to both parts now.
(E) both reflect the success of its restructured global bottling system and to what extent poor currency exchange rates are keeping - Wrong as the verb "reflects" doesn't apply to both parts now.