下列各组中的性质比较，正确的是
①酸性：HClO4>HBrO4>HIO4
②碱性：Ba(OH)2>Ca(OH)2>Mg(OH)2
③还原性：F->C1->Br-
④稳定性：HCl>H2S>PH3
⑤熔沸点：HI>HBr>HCl> HF
| A．①②④ | B．①②③ | C．②③④ | D．①②④⑤ |
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