So now i m learning bass . it 's been almost 2 months learning . : hyper : but before i got my bass i signed up for beggining guitard elective in h.s . because my sister has a fender ( even though she ca n't play ) so i decided i 'll play guitard if my parents do nt buy me a bass .

Available options:
[a]. They thought they were signing up for bass .;
[b]. They had wanted a guitar .;
[c]. They thought they bought a guitar but it was a bass .;
[d]. None of the above choices .;
Q: What may be the reason why they signed up for guitar before they got a bass ?
[b].