Everybody called it a lavish party.

Answer: Option B

Lavish : sumptuously rich, elaborate, or luxurious.
Expensive : costing a lot of money.
Frugal : sparing or economical as regards money or food.
Wasteful : (of a person, action, or process) using or expending something of value carelessly, extravagantly, or to no purpose.
Big : of considerable size or extent.

Antonym of Lavish is Frugal