What the element ‘es’ indicates is third person singular, presen

What the element ‘es’ indicates is third person singular, present tense, the element ‘ed’ past tense, and ‘ing’ progressive aspect. Since they are the smallest unit of language and meaningful, they are also ______.
A、phonemes
B、morpheme
C、allophones
D、phones
【正确答案】：B
【题目解析】：词素是不能够被进一步分割的最小语言单位。