Final answer:
The equation that represents the situation where June added 6 seashells to her collection is 6 + x.
Step-by-step explanation:
The equation that represents the situation where June added 6 seashells to her collection is:
C) 6 + x
June started with a certain number of seashells, represented by the variable x. When she added 6 seashells to her collection, the equation becomes 6 + x, where 6 represents the number of seashells added and x represents the original number of seashells June had.