Puzzle Corner #5

There are 3 jars, namely, A, B, C. All of them are mislabelled. Jar A contains red marbles, jar B contains blue marbles and Jar C contains red and blue marbles mixed in a random proportion. You can put your hand in a jar and pick only one at a time. Tell the minimum number of marble(s) that has/have to be picked in order to label the jars correctly.

Send your correct answers to latest by midnight of 10th October 2022 for lucky draw on 11th October 2022 for selecting the winner.