The best way to correct mistakes that learners make, is to: (1)

a. Have learners correct the mistake themselves.
b. Give an immediate indication that a mistake has been made.
c. Let other learners point out the mistake that has been made.
d. Ridicule the learners who make mistakes.

The best way to correct mistakes that learners make is to have learners correct the mistake themselves (option a). This approach encourages critical thinking and self-correction, leading to better retention and understanding of the correct information. Giving immediate indications of mistakes (option b) can also be helpful, but it is important to give learners the opportunity to correct themselves. Letting other learners point out mistakes (option c) may create a competitive or uncomfortable environment, and ridiculing learners (option d) can be detrimental to their learning and motivation.