During human gestation, rudiments of all organs develop:

while the embryo is in the oviduct.

in the second trimester.

in the third trimester.

during the blastocyst stage.

in the first trimester.

Answer: First Trimester

Explanation:

While the normal human gestational period lasts for approximately nine months, the rudiments of all major organs arise during a relatively short period comprised (approximately) between the fourth and eight weeks of development.

Note that the embryo spends only the first 5-7 days in the oviduct, and begins implantation as a blastocyst with no organ rudiments per se.