Indict means to formally accuse of or charge with a crime and acquit means to free (someone) from a criminal charge. Hence, the correct option is Acquit. 'Condemn' means 'to sentence to be punished', which is similar to indict. Hence, it is not the antonym of 'indict'. 'Reprimand' means to scold severely, while 'allege' means to declare or assert something. Hence, options B and D are also incorrect.