Question

Which indirect Object pronoun correctly completes the sentence?

Answer 1

B:les I think ok not sure

Answer 2

B 

"Me" digo la verdad = I tell the truth to myself
This is grammatically incorrect to say in Spanish.

"Le" digo la verdad = I tell the truth to her/him/you (f.) 
'Vosotros' does not refer to any of these pronouns. 

"Nos" digo la verdad = I tell the truth to us  
This is grammatically incorrect to say in Spanish.