Which sweet paste, made from Seville oranges, is traditionally spread on toast and forms part of the classic 'Oxford breakfast' pairing?

• A Marmalade ✓
• B Lemon curd
• C Fruit butter
• D Fruit cheese

Marmalade is distinct from jam in using citrus peel suspended in a clear jelly; the Oxford variety is dark and rich from long boiling, first commercialised by Frank Cooper in 1874.