Official Explanation
Think about the structure of the sentence. It begins with three parallel absolute phrases, each telling about some aspect of Hurston’s literary position at a particular time in her career. All three phrases are positive in tone. The concluding independent clause (“Hurston clearly was at the ________ of her career”) should be positive as well.
Now examine the first blank. What reaction did people have to Hurston’s novel? Look at the part of the sentence without any blanks: “her literary gifts (were) acknowledged by the chief figures of the Harlem Renaissance.” In acknowledging Hurston’s gifts, these literary luminaries were praising her novel. Her novel clearly had been published to great acclaim (approval).
Next, study the second blank. You know that, at the time this writer is discussing, Hurston’s standing in the literary world was high. Her novel was acclaimed; her gifts were acknowledged (recognized). This third absolute phrase also must state something positive about Hurston. Recast it as a sentence: Her reputation (was) as yet ________ by envious slights. Envious slights (insults or slurs, prompted by jealousy) would have had a negative effect on Hurston’s reputation. However, as yet, at the time under discussion, no negative comments had besmirched Hurston’s reputation, which was untarnished (spotless; unblemished).
Finally, consider the third blank. How would you describe Hurston’s career at the time under discussion? It was at its highest point: in years to come envious slights would tarnish her reputation and her novels would be forgotten, but for the moment Hurston was riding high: she was at the zenith (peak) of her career.
Answer: C,F,G