Which sentence needs a hyphen?

One of the most common uses of hyphens is to join two or more adjectives that are modifying the same noun, this is the case of sentence B, the adjectives "chocolate" and "covered" are modifying the noun "pretzels" so, to avoid misunderstandings, we should add a hyphen between them. An example is " I would like a chocolate-covered pretzel"

The change in her position (from beginning to end), along with the direction, is considered her displacement. This value is a measurement and a direction. The total distance along the path from her starting point to her end point is considered her distance. This value is a measurement only.

Explanation: