A). How crucial the word "like" is to people's ability to communicate with each other .
Explanation:
Simile is exemplified as one of the most commonly employed literary devices to compare one thing to another with the use of 'like' and 'as'. Such comparison primarily intends to add vivid details to the description or make it more emphatic.
As per the question, the simile employed in lines 21-22 functions to demonstrate and emphasize that 'how significant the word 'like' is for people' ability to communicate with each other' which helps them build interaction and communication. The author intends to emphasize the vitality of the idea through the comparison with use of simile. Therefore, option A is the correct answer.
