The stage of human development that is expected to first see a beating heart is the embryonary stage (Option C).
- The heart of an embryo starts beating at approximately week 5 of pregnancy.
- The first two weeks of human development after conception is called the germinal stage, whereas the stage of development lasting from the third until the eighth week of pregnancy is called the embryonic stage.
- This stage (embryonic stage) starts once the zygote is implanted in the uterine wall.
In conclusion, the stage of human development that is first expected to see a beating heart is the embrionary stage (Option C is correct).
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