Step 1: Understand fertilization and embryo development.
After fertilization, the zygote is formed and travels to the fallopian tube for implantation.
Step 2: Identify the embryo stage.
The embryo is transferred at the zygote stage, which occurs after fertilization.
Step 3: Conclusion.
Therefore, the correct answer is ((C), as the zygote is the stage when the embryo is transferred to the fallopian tube.
Final Answer:
\[
\boxed{((C) \; Zygote}
\]