After becoming very angry with your sister and wishing that she were dead you drean about pushing her off a cliff. accoording to freud the latent content of dream would be while the manifest content would be

To wish  that she were dead and pushing her off the cliff.  

Explanation:

Latent content and manifest content, these are the two concepts introduced by Freud to help people to understand the meaning of their dream. The manifest part of the dream that people remember or we can say it is the story line of the dream. Latent content is hidden and inferred part of the dream that people can not recall but show the true meaning of the dream. Freud thought that through the dream analysis he would help his patients to uncover their hidden secrets.The manifest dream was the interpretation of the dream without hidden meaning. He thought that through the manifestation of the dream he can resolve the problem of his patient's conflicts in their life

i am pretty sure it is d.