**Core Concept**
The use of antenatal steroids, such as **betamethasone**, is a well-established practice to enhance fetal lung maturity in cases of preterm labor. This therapy is based on the principle that **glucocorticoids** can accelerate the production of **surfactant** in the fetal lungs, thereby reducing the risk of **respiratory distress syndrome (RDS)**.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general principle. Antenatal steroids are given to mothers at risk of preterm delivery to reduce the incidence of RDS in the newborn. The therapy is most beneficial when there is a risk of preterm birth, and the fetal lungs are likely to be immature.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but generally, antenatal steroids can be given in most cases of preterm labor.
**Option B:** Similarly, this option is missing, but antenatal steroids are often used in cases where preterm delivery is anticipated.
**Option C:** Without the specific details of this option, it's hard to comment, but typically, antenatal steroids are not contraindicated based on the scenarios usually presented.
**Option D:** This option is also not provided, but usually, the decision to withhold antenatal steroids would be based on specific contraindications or conditions where the benefits do not outweigh the risks.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that antenatal steroids are most effective when given between 24 and 34 weeks of gestation, as this is the period when the fetal lungs are most likely to benefit from the therapy.

**Correct Answer:**