a)I think that it isn't a good idea to take only sweet food becouse we can't live only with that and we need drink after that
b)In my opinion the best would be water and few sandwiches ,that is a great connection.
c)If you don't think that my solution is good than we should take same part of my food and part of yours.
a)i don't think that pizza is a good idea for birhtday party becouse it's too popular
b)In my opionion better choice could be spaghetti or lazania becouse it is tasty
c)We can also connect our solutions and let guests choose what they want.