Antony asks that they allow him to take the body to the marketplace and, further, that he be allowed to orate at the funeral.
Here are the lines Antony delivers to the Servant (who is to take the news to the conspirators):
Ant.
Post back with speed, and tell him what hath chanc'd: Here is a mourning Rome, a dangerous Rome, No Rome of safety for Octavius yet; Hie hence and tell him so. Yet, stay awhile; Thou shalt not back till I have borne this corse Into the market-place: there I shall try, In my oration, how the people take the cruel issue of these bloody men; According to the which thou shalt discourse To young Octavius of the state of things. Lend me your hand.
Post back with speed, and tell him what hath chanc'd: Here is a mourning Rome, a dangerous Rome, No Rome of safety for Octavius yet; Hie hence and tell him so. Yet, stay awhile; Thou shalt not back till I have borne this corse Into the market-place: there I shall try, In my oration, how the people take the cruel issue of these bloody men;
I believe the correct answer is pleasant and attentive. The author is stating in the excerpt that he though he would be getting his freedom back because of his 'gentleness and good behavior.' He wanted everyone around him to feel happy but also to do good things in order to be free again.