**Core Concept**
The weight of the placenta is an important indicator of placental development and function. A normal placental weight at term is crucial for fetal growth and well-being. The placenta's weight is influenced by factors such as maternal health, fetal size, and gestational age.

**Why the Correct Answer is Right**
The average weight of a placenta at term is approximately 470 grams. This weight is essential for maintaining adequate fetal growth and development. The placenta's weight is influenced by the number of villi, the surface area for gas and nutrient exchange, and the overall placental development. A placenta that is too small may lead to inadequate nutrient and oxygen supply to the fetus, resulting in growth restriction.

**Why Each Wrong Option is Incorrect**
**Option A:** 300 grams - This is significantly lower than the average placental weight at term and may indicate placental insufficiency.
**Option B:** 1,000 grams - This is excessively high and may be associated with placental abnormalities or fetal macrosomia.
**Option C:** 200 grams - This is too low and may indicate a small or abnormal placenta.

**Clinical Pearl / High-Yield Fact**
A placenta weighing less than 300 grams or more than 600 grams at term may be associated with adverse fetal outcomes, such as growth restriction or preeclampsia.

**Correct Answer: C. 200 grams.**