I also agree this is a D. conspiracy.
These two individuals have conspired to commit a crime, but they haven't done it yet. Homicide is murder; solicitation has to do with prostitution; attempt is also wrong because they haven't attempted the crime yet; trespassing is also wrong because they haven't trespassed another person's property yet, which leaves us only with conspiracy.
The answer is C... Ernesto Miranda was not read his rights before he had confessed of his crime