Final answer:
A stationary front remains stationary, meaning the air masses on either side do not move it significantly.
Step-by-step explanation:
Elements of a stationary front do not move eastward, oscillate, or move in a circular motion. Rather, they remain stationary, which is why it's called a stationary front. The term "stationary" comes from their characteristic of neither advancing significantly nor retreating - the air masses on either side of the front do not have enough force to move one another, causing the front to stay relatively still.