Read the following article and answer the question by choosing from the options.

I threw a party for my boss at work to mark his 10 year anniversary for opening up his own business . It was a very small event , I even baked the cake . Thing is , the next day he barely spoke to me . He was even rude at one point .

Why did they throw their boss a birthday party ?
Possible answers:
(a). None of the above choices .
(b). They wanted their boss to feel better .
(c). They wanted to do something nice for their boss .
(d). They knew their boss would n't like the party ....A:
(c).