Why Do Children Use the Past Tense Verbs Incorrectly (I

Why do children use the past tense verbs incorrectly (i.e. ,"Mom goed to work" or "I rided my bike") ?

A) Children learn from their environment,and if they are around other children who speak incorrectly,they will imitate their peers.
B) Children often overgeneralize grammatical rules,including those for the present and past tense.
C) Children often do not hear the necessary feedback for correct usage until they reach school age.
D) Children do not understand the present and past tense of verbs,so they initially ignore feedback until they have assimilated existing schemas.