选近义词1.Are you familiar with the "phonological" rules of Engl

选近义词
1.Are you familiar with the "phonological" rules of English language.
A.syllabic B.grammatical C.pronunciational
我在纠结是选A还是C，phonological是音韵学的，语音体系的
A是音节的,C是发音的。觉得都挺像的，请教下高手我该选哪个？
2.There were deeper tensions "underlying" last week's outburst
A.analyzing B.under C.behind
选的词要怎么理解？