1. After you read the three friends' self-introductory passages, complete the following table.

2. After you take a look at the table summarized above, introduce one of/among the three friends to your classmates.

(They are directions. Are they grammatical? And in sentence 2, do we have to use 'of' or'among'? Are both OK?)

Use 'of' in 2.

Then both are fine.