The freezing point of a substance is the same as that substance's melting point.
At this particular temperature, the substance can exist as either a solid or a liquid.
Only CH4 is covalently bonded. All other compounds are ionic compounds.
So A is the answer.
Hope it helps!
Answer: aerodynamic force
Explanation:
The time-varying aerodynamic force causes the ball to move erratically. This motion is the source of the "dancing" knuckleball that confuses both batters and catchers alike.