He arrived shortly after and we all congratulated him for his birthday . The meal was gorgeous we had a banquet and they lit sparklers on his cake when we sang happy birthday .

Question with options to choose from: What might be the reason he arrived later than we did ?
OPTIONS:
a). We might have had a party he knew about .;
b). We might have had a party he did n't want .;
c). We might have had a party he wanted .;
d). We might have had a surprise party for him .;
d).