The key here is vocabulary more than context. The sentence
is about a psychic and her credibility as a prophet. Since you know
that a psychic predicts the future from signs, you are looking for a word
related to predict. Disfigured and deterred you can eliminate quickly
because they clearly don’t deal with predictions. To repudiate is
to renounce or reject, so you can eliminate it. Circumvent means
to surround (think of the prefix circum, like circle). Portend (D)
fits because it means to predict.