Which word in the passage contains a prefix that means "in the front"?

The Painting

I had been working on my painting for a week. The assignment was to paint something untouched by humans. My preliminary plan was to paint a desert landscape to show the biodiversity of the region.
"This is lovely," my art teacher said from behind me. "I really love the colors in the cliffs. What do you think you will put in the foreground?"
"I am not sure yet. I think maybe a blooming cactus," I answered.
She nodded and smiled, "Yes, that would be awe-inspiring."
I smiled to myself, finally feeling excited about an art project. I was unconfident when the class began a month ago, but at that moment I felt like I was finally improving.

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preliminary
foreground
biodiversity
unconfident

Foreground