wE know From this pAssAgE thAt out At sEA, whEn wAvEs going in oppositE DirECtions mEEt, thEir ForCE ______.
A．CAusE grEAt DAmAgE
B．ExtEnDs to thE oCEAn Floor
C．is liABlE to lEssEn
D．inCrEAsE rApiDly