The correct answer is (a).
Section 312 of the Code of Criminal Procedure 1973 states that an accused person may be a competent witness in his own defence. This means that the accused person can give evidence in court in his own defense. The accused person can also cross-examine the witnesses who have given evidence against him.
The other options are incorrect because they do not state that an accused person may be a competent witness in his own defense.
Section 313 of the Code of Criminal Procedure 1973 states that the accused person has the right to cross-examine the witnesses who have given evidence against him.
Section 315 of the Code of Criminal Procedure 1973 states that the accused person has the right to make a statement under Section 313 of the Code of Criminal Procedure 1973.
Section 316 of the Code of Criminal Procedure 1973 states that the accused person has the right to be present at the trial.