I am pretty sure I just made my brother the happiest guy on the face of the planet . He has been a Mustang car nut for as long as I can remember . Him and his friends are always going out buying new parts , helping each other put them on , and all that good fun stuff . It 's something I never understood , but oh well he loves to do it .

Question: What may be the cause for their brother 's happiness ?
Answer: None of the above choices .They bought their brother parts for his Mustang .They had bought their brother a Mustang car .They took their brother to a car show .