Final answer:
The pairs that are homonyms are 'Piece and peas' and 'Which and witch'.
Step-by-step explanation:
A homonym is a word that sounds the same as another word but has a different meaning. From the given options, the pairs that are homonyms are:
OB. Piece and peas: 'Piece' refers to a part or portion of something, while 'peas' refers to a type of vegetable.
OC. Which and witch: 'Which' is used to ask about choices or options, while 'witch' refers to a person who practices magic or sorcery.
Learn more about Homonyms