We always have much?each other when we meet.

根据习惯,tell可以直接跟“人”的宾语,例如：
He told me a story.他给我讲了一个故事.
其它三个如要跟“人”作为说的对象,都必须用介词to.
each other代替“我们”是“人”所以只能用B.
speak直接跟的宾语大都是语言,例如
He often speaks English to me.他常常跟我说英语.
say直接跟的宾语大都是讲的内容,如
He came to say good-bye to me.他来给我道别.
talk用作及物动词的机会很少,遇到时作为习惯用语记.常用的是不及物动词,例如
He talked in English to me.他用英语和我谈话.