"This makes it much more difficult for Coffee Arabica to interbreed with other species" -> Not easy to interbreed
"Coffee Arabica contains multiple copies... a phenomenon called polyploidy" -> Arabica has polyploidy
"Coffee Arabica's main source of single nucleotide is mutation" -> Not hybridization
-> Option 1: Hybridization main source - False
-> Option 2: Two chromosome copies - False
-> Option 3: Displays polyploidy - True ✓
-> Option 4: Easily interbred - False
The answer is Option 3 - It displays the phenomenon of polyploidy.