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.
Los turistas SIGUEN el mapa.
Http://conjugator.reverso.net use that website just type the verb and look for what you need hope this helps :)