Question

When knowledge of sugar was just beginning to spread from India, from Persia, from Greece, from the great school of Jundi Shapur, cooks working for the wealthiest people treated it as a spice, blending it with other tastes. They continued to do that for another thousand years.

What evidence from the passage supports the inference that sugar was expensive and not available to everyone?

"from the great school of Jundi Shapur"
"cooks working for the wealthiest people"
"treated it as a spice, blending it with other tastes"
"They continued to do that for another thousand years"

Answer 1

"cooks working for the wealthiest people"

Explanation: that phrase directly implies sugar was used primarily by rich households, so it was not widely available and therefore expensive. (You could also argue "treated it as a spice" supports this, since spices were used sparingly because they were valuable.)