【正确答案】 E

【答案解析】Verb form; Idiom
This sentence describes analysts' prediction about prices for gasoline and heating oil. The speculative nature of the analysts' comments is communicated through the modal verb may be, so there is no need to reiterate that idea with the wordy phrase of the possibility of. The correct idiom to contrast prices with the norm is higher than usual—not usually, as written. The correct idiom to indicate the span of time from the present to the end of the year is through the end of the year. A simple future tense verb would concisely communicate the analysts' prediction: prices will stay higher than usual through the end of the year.
A The unnecessary phrase of the possibility of makes the sentence wordy; higher than usually is not a proper idiom.
B The unnecessary phrase of the possibility that makes the sentence wordy; throughout the end of the year is not a proper idiom.
C Possibly is redundant with may and is not needed to indicate the speculative nature of the prediction; higher than usually is not a proper idiom.
D The conditional verb tense could stay is incorrect since the modal verb may has already introduced the concept of possibility; throughout the end of the year is not a proper idiom.
E Correct. The simple future tense verb will stay expresses the analysts' prediction, and idioms are used correctly.
The correct answer is E.