Which of the following broadleaf shrubs can tolerate severe pruning?

Crepe Myrtle is the correct choice for a broadleaf shrub that can tolerate severe pruning. This plant exhibits a remarkable resilience to heavy cutting, which can rejuvenate its growth and enhance its flowering capabilities. When pruned aggressively, Crepe Myrtles can produce more vibrant blooms and maintain a desirable shape. This adaptability to severe pruning also allows for versatility in landscape design, as the shrubs can be shaped or reduced in size without detrimental effects on their overall health.

In contrast, the other options each have specific growth habits and sensitivities. Camellias, for example, do not respond well to severe pruning and can suffer from stress or even reduce flowering if heavily cut. Boxwoods can endure some pruning but should be trimmed cautiously to maintain their shape and health, as excessive pruning can lead to dieback in older wood. Nandina is also not as tolerant to severe pruning; while it can handle light pruning to maintain shape, severe cutting may compromise its health and growth patterns.