An indirect object is the beneficient of the action, or for whom the action is done. It often has the form of "for x" or "to x", but not always.
Among the options the indirect object is found in the option C:
C. They gave me a bonus.
the indirect object is "me"
These are stage directions (A). As you probably know, The Importance of being Earnest is a play. This scene is not one that would be read out to the audience, it is what the audience would see on stage, ie stage directions. Since you are reading the play's script and cannot see the action on stage, stage directions have been provided for you in your text.
The adjective phrase "am sending" modifies the word "I"
Hope this helps =]
