Why is sugar considered a solid even though it takes on the shape of its container?

Because the molecules in the sugar are structured as a solid 

Because when they are in a container it isn't just a single bit of sugar, there are many grains there. Each individual grains molecules are structured like a solid

Is there a diagram/picture you can provide? it seems this question goes along with a

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.