Two rods of the same shape are held at their centers and rotated back and forth. The red one is easier to rotate than the blue one. Why?

1. The red one is heavier.
2. The blue one is heavier.
3. The red one has its mass concentrated more toward the center, while the blue one has its mass concentrated more toward the ends.
4. The blue one has its mass concentrated more toward the center, while the red one has its mass concentrated more toward the ends.

The rods have the same mass, but red one has its mass concentrated toward the center, while the mass of the blue rod is mostly at the ends.