Krashen sees the learners emotional state or attitudes as an adjustable filter that freely passes, impedes, or blocks input necessary to acquisition. According to his theory:
A. During adolescence the affective filter operates in lesser extent.
B. High affective filter acquirers will interact with more confidence.
C. Acquirers with a low affective filter seek and receive more input.
D. It is believed that the affective filter often rises in early childhood.