Answer: D. Because she is an extremely competitive athlete
Step-by-step explanation:
Even though she had just recovered from a severe bout of influenza, Julie did not want to miss her upcoming basketball game because she is an extremely competitive athlete.
Option A is wrong because the word ''being'' being there aims to depict Julie as only being extremely competitive at that moment whereas it would make more sense if she were always competitive.
Option B is wrong for using both being and for the adjective, ''extreme'' instead of the adverb, ''extremely''.
Option C is incorrect and Option E is incorrect because due to the misuse of the phrase ''in spite''.