B. Keep it, because it draws on information discussed throughout the passage to suggest that the audience take a different, more practical approach to language learning.
Explanation:
Answer B
Correct. The sentence should be kept in the passage. It provides a unified conclusion to the passage’s argument, using information discussed in the passage to engage the audience by suggesting a change in attitude toward adult second-language learning.
Keep it, because it draws on information discussed throughout the passage to suggest that the audience take a different, more practical approach to language learning.