there isn't＿in the office .Aanyone B;any people 选哪个,为什么,

there isn't＿in the office .Aanyone B;any people 选哪个,为什么,
there isn't＿in the office .Aanyone B;any people 选哪个,为什么,

there isn't＿in the office .Aanyone B;any people 选哪个,为什么,
当然选A.
如果是肯定句,说There is someone in the office,表示办公室里有人.它的否定就把someone改成anyone.
B不符合英文表达习惯.