They invited him to sumptuous lunch.

Answer: Option B

Sumptuous : splendid and expensive-looking.
Cheap : low in price, especially in relation to similar items or services.
Meagre : (of something provided or available) lacking in quantity or quality.
Poor : lacking sufficient money to live at a standard considered comfortable or normal in a society.
Nutritious : efficient as food; nourishing.

Antonym of Sumptuous is Meagre