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The choice identified as Pansy is the correct answer because pansies are typically shorter plants, usually ranging from about 6 to 12 inches in height. In gardening design, the back of a flower bed is reserved for taller plants that can provide a good backdrop for shorter varieties, allowing all plants in the bed to be visible and aesthetically pleasing.
In contrast, Cleome, Amaranthus, and African Marigolds are all generally taller plants, making them suitable candidates for planting in the back of a flower bed. Cleome can grow up to 3 to 4 feet tall, Amaranthus can reach similar heights depending on the variety, and African Marigolds typically grow around 1 to 3 feet tall. Their heights help create layers within the planting scheme, contributing to a visually dynamic and well-structured garden. Thus, placing shorter pansies at the back would not align with the principles of good flower bed design.