**Core Concept**
The question requires knowledge of obstetric definitions and fetal development. The weight of an abortus, also known as a fetus or embryo that has been expelled from the uterus, is a critical parameter in assessing fetal development and determining the gestational age.

**Why the Correct Answer is Right**
The weight of the abortus varies depending on the gestational age. A normal intrauterine fetus typically weighs between 300-400 grams at 12-14 weeks of gestation and increases to approximately 3-4 kilograms at term (37-40 weeks). The weight of an abortus can be used to estimate the gestational age, with higher weights indicating more advanced gestation. This is because fetal growth and weight gain are closely related to the development of the placenta and the availability of nutrients and oxygen to the fetus.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not provide a realistic estimate of fetal weight at any gestational age.
**Option B:** This option is incorrect because it is too high and would not be consistent with fetal development at this gestational age.
**Option C:** This option is incorrect because it is too low and would not be consistent with fetal development at this gestational age.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the weight of the abortus can be used to estimate the gestational age, with higher weights indicating more advanced gestation. This is a critical parameter in assessing fetal development and determining the need for further evaluation or intervention.

**Correct Answer: C. 350 grams**