Explanation:

Let’s break this down:

- Lifting an object up and down means it goes up, then comes back down, repeating this—a classic back-and-forth.

- A parade of an army is just marching in one direction—it’s straight line, not back and forth.

- Free fall of a heavy object is falling down only, not moving up and then down repeatedly.

Now, the options:

- Rectilinear motion is moving in a straight line. Works for a parade, and free fall, but not for anything that repeats up and down.

- Periodic motion is anything that repeats at regular intervals (like a clock’s hands). But “parade” and “free fall” don’t repeat, so not quite right.

- Rotational motion is spinning—think a wheel or a record. None of these examples are spinning.

- Oscillatory motion is a type of periodic motion—think back and forth, like a swing or a pendulum. Lifting something up and down fits right in.

Correct Answer:

- Oscillatory motion (Option 4)

That’s the one. Up and down, repeating—textbook oscillation.