According to the experiment of Diane Dodd, can adaptive divergence of allopatric fruit fly populations lead to reproductive isolation?

• A. Yes. After several generations, the reproductive barrier (behavioral isolation) between the starch- and maltose-fed populations was complete.
• B. Yes. After several generations, the reproductive barrier (mechanical isolation) between the starch- and maltose-fed populations was complete.
• C. No. After several generations, the formation of a reproductive barrier (mechanical isolation) was evident but not absolute.
• D. No. Even after several generations, there was no evidence of a reproductive barrier forming between the populations.
• E. No. After several generations, the formation of a reproductive barrier (behavioral isolation) was evident but not absolute.