verbs - Simple past vs. present perfect

I have a few questions about simple situations.

1. 
   

   What should I say to another person right after falling?
   a) I fell
   b) I have fallen

   
   


2. 
   

   What should I say to another person right after throwing a ball?
   a) I threw the ball
   b) I have thrown the ball

   
   


3. 
   

   What should I say to another person right after taking something?
   a) I took
   b) I have taken

   
   

Please provide explanations for your answers.