she tells me ____ my picture are good or not

she tells me ____ my picture are good or not
新概念第26课第5问
a.weather b.that c.if d.unless
Standard answer:c
为什么网上有人说是a?
1.a选项是weather不是whether
2.牛津高阶英汉双解词典(第七版)if例句:I wonder if I should wear a coat or not.
3.朗文当代高级辞典(英汉双解)第四版if例句:I'm not sure if this is the right road or not.