In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: Prokaryotes are single-celled organisms that lack a nucleus., Fact2: Prokaryotes All bacteria are prokaryotes., Question: What are single-celled organisms that lack a nucleus? (A) barnacles (B) bacteria (C) Most plants (D) ferns (E) orchids (F) cacti (G) PDAs (H) Leeuwenhoek
B