How does the video explain why adult speakers of Japanese may struggle with the difference between the English sounds [r] and [l]?
Select one:

a. Adult learners are less motivated than children at mastering a new language and blending into a new culture, and as a result often hang on to their accent as a marker of identity.

b. Adult learners, much like children, have the tendency to overgeneralize grammatical rules.

c. While adult speakers of Japanese can hear the difference between English [r] and [l] correctly, they will struggle to articulate them accurately.

d. Adult learners are culture-bound listeners: since they are past their critical period, they have lost most of their ability to discern sounds that are not relevant for their first language.

e. Adult learners rarely have the opportunity to experience full immersion in the language they are learning (like babies do), and as such they learn it imperfectly.