What is the best way to characterize the relationship between a simultaneous bilingual's L1 and L2? A) They learned how to speak their L2 in adulthood, and so will likely never have native-like proficiency in their L2
B) They are more proficient in their L1 than their L2.
C) If they continue to speak both languages throughout their youth and into adulthood, they are likely equally proficient in both languages.
D) They are more proficient in their L2 than their L1.