Each of these relationships reflects a correlation. Which relationship most likely reflects both correlation and causation?

a) for gardeners, plating more tomatoes is associated with harvesting more tomatoes
b) for garden centers, selling more tomato plats is associated with selling more pepper plants
c) for cooks, slicing more tomatoes is associated with washing more lettuce

Relationship a) most likely reflects both correlation and causation. In this case, planting more tomatoes directly leads to harvesting more tomatoes, indicating a causal relationship between the two variables. The other relationships (b and c) only show a correlation between variables, but do not necessarily imply causation.