请老师帮忙解释以下B与C的区别。曼哈顿RON的解释如下（但是看不太懂）：let me have a go at it, in simpler language: whenever you use a parallel structure with omitted/elided words, the EXACT omitted word(s) MUST be present, IN PARALLEL STRUCTURE, elsewhere in the sentence. this means in exactly the same form - no alterations, no tense changes, no nothing. this kills choice (b). that choice ends with "...than they have been", which omits a participle: in other words, it's actually "...than they have been ______", where the ______ is clearly seen to be setting (dividends). since the EXACT WORD setting doesn't appear anywhere else in this sentence, the sentence is incorrect. by contrast, choice (c) is a-ok on this point. this choice also contains "...than they have been (__________)", where the parallel concept, "(more) conservative", actually appears elsewhere in the sentence.说是忽略了分词setting。啥意思？不懂……

请老师帮忙解释以下B与C的区别。曼哈顿RON的解释如下（但是看不太懂）：let me have a go at it, in simpler language: whenever you use a parallel structure with omitted/elided words, the EXACT omitted word(s) MUST be present, IN PARALLEL STRUCTURE, elsewhere in the sentence. this means in exactly the same form - no alterations, no tense changes, no nothing. this kills choice (b). that choice ends with "...than they have been", which omits a participle: in other words, it's actually "...than they have been ______", where the ______ is clearly seen to be setting (dividends). since the EXACT WORD setting doesn't appear anywhere else in this sentence, the sentence is incorrect. by contrast, choice (c) is a-ok on this point. this choice also contains "...than they have been (__________)", where the parallel concept, "(more) conservative", actually appears elsewhere in the sentence.说是忽略了分词setting。啥意思？不懂……