In an Experiment, Rats' Ovaries Were Removed Immediately After Impregnation

$$\begin{array} { | l | c | c | } \hline & \bf { Group 1 } & \bf { Group 2 } \\\hline \begin{array} { l } \text { Daily injections of } \\\text { progesterone (milligrams) }\end{array} & 0.25 & 20 \\\hline \begin{array} { l } \text { Percentage of rats that } \\\text { carried foetus to birth }\end{array} & 0 & 100 \\\hline\end{array}$$
In an experiment, rats' ovaries were removed immediately after impregnation, and then the rats were divided into two groups. Treatments and results are summarised in the table. The results most likely occurred because progesterone exerts an effect on the ________.

A) general health of the rat
B) metabolism of the uterus
C) gestation period of rats
D) number of eggs fertilised

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