Answer :
Final answer:
Melinda should sign her brother's age in ASL by using the number signs for '21', without including additional motions such as signing 'old' or starting at specific body locations like the shoulder or chin.
Explanation:
The correct way for Melinda to sign her brother’s age in American Sign Language (ASL) is not explicitly provided in the options listed. However, typically in ASL, when indicating someone's age, you would sign the number corresponding to the age, moving the hand outward from the shoulder or chest without needing to sign the word 'old' or using shoulder level as a starting point. As such, the best answer might be to simply sign the number '21' using the appropriate number signs in ASL, typically done by starting with your dominant hand in a "2" shape and then transitioning to a "1" shape.