Question

why do historians describe the gilded age as shiny on the outside, but full of struggle on the inside?
because it was a time of widespread equality
because economic growth masked social inequality and labor struggles
because factory workers lived in luxury
because precious metals were discovered in north carolina

Explanation:

The Gilded Age refers to a period of superficial economic prosperity in the US, but beneath this "shiny" surface, there was severe social inequality, poor working conditions, and labor conflicts between wealthy industrialists and marginalized workers.

Answer:

Because economic growth masked social inequality and labor struggles