Which of the Following Statements Is/are True About Second-Language Learning

Multiple Choice

Which of the following statements is/are true about second-language learning?

A) Proficiency in a second language is related to the age at which exposure to the language begins.
B) Evidence suggests that second language acquisition goes through a gradual decline in childhood rather than a sudden discontinuity at puberty.
C) Learning a second language early in life leads to greater proficiency in adulthood.
D) All of these are true.