Shapes or Lines?

Which are lines and which are shapes? a, b, c, or d?

I'd say they are all can be both lines or shapes. As in if I stretch or look them up from further distance a, b, c, or d they're all can be lines. And if I blow them up until they get really big, they're all can be shapes as well.



STRING & DRAW PRACTICE
I found the string practice quite interesting. My classmates used all the upper area (table, chair, etc,) I was trying to do underneath them all in purpose to make it more complex, but all I had was just a mess and In the end, it was me who ended up being the last. I wish I know the purpose of this activity other than just having fun.