Here are some sets of words in some pattern. Find what are these known as in teaching-learning of pronunciation ?
bit-bet, did-dead, hid-head, lid-lead, miss-mess, pin-pen, lock-luck

The correct answer is Option 1: Contrastive pairs.

In the teaching and learning of pronunciation, pairs of words like "bit-bet", "did-dead", "hid-head", "lid-lead", "miss-mess", "pin-pen", and "lock-luck" differ by only a single sound (phoneme) in the same position, which changes the word's meaning.

These pairs are known as contrastive pairs (or minimal pairs). They are used in language teaching to help learners distinguish between similar sounds (such as the short vowel sounds /ɪ/ and /e/ in bit vs. bet) and improve both listening discrimination and pronunciation accuracy.