Under Article III, Section 12, a person under investigation for an offence has the right to remain silent and to:
Correct answer: D. Have competent and independent counsel, preferably of his own choice
Section 12 gives the right to remain silent and to have competent and independent counsel, preferably of one's own choice; if the person cannot afford one, counsel must be provided. These rights cannot be waived except in writing and in the presence of counsel.