Explanation:

In option A, though the word 'rising' is suitable for the first blank, the second word 'even' would be inappropriate for the second blank both grammatically (because article 'an' must be used before the word) and contextually. The word 'uneven' would have been correct in its place.
In option B, the word 'complementary' doesn't make any sense if used for the second blank. And similarly, in option C, the word 'endearing'  and in option E, the word 'demeaning' would be illogical or absurd if used for the first blank in the sentence. Clearly, options B, C and E hence get eliminated.
In option D, the word 'staggering' which means 'very shocking and surprising' and the word 'skewed' which means 'not even' fit the blanks both grammatically and contextually. 
Option D is hence the correct answer.