The sentence describes a team working together smoothly to achieve a goal.
Step 1: Understand options
- Unity: being one or undivided; related but not the best fit here.
- Harmony: working together in agreement and without conflict; best fit.
- Synchronization: timing things to happen at the same time; less about agreement.
- Collaboration: working jointly, but "harmony'' emphasizes peaceful cooperation.
Step 2: Choose the best fit
Option (B) "Harmony'' best expresses smooth, agreeable teamwork.