By"languageacquisitionisprimarilytheacquistionofthegrammaticalsystemoflanguage",linguistsmeanthat______.
A、everyspecificruleallowedbythegrammaticalsystemofalanguagemustbeacquired
B、thephonologicalrulesmustbeacquired
C、thesyntacticrulesmustbeacquired
D、thegeneralprinciplesthatarefundamentaltothegrammaticalityofspeechmustbeacquired