The pronoun used to show possession in the sentence "They asked about the bike, and I told them it was mine" is "mine." Here's how it works:
1. "They" is a subject pronoun that refers to the people who asked about the bike.
2. "I" is a subject pronoun that refers to the person speaking.
3. "It" is a pronoun used to replace the noun "bike" in the sentence.
4. "Mine" is a possessive pronoun that shows ownership or possession. In this case, it indicates that the bike belongs to the speaker.
So, in this sentence, "mine" is the pronoun used to show possession.
