Question

Read the following passage carefully:

The glass panes of the conservatory were clouded with condensation, trapping the heavy, humid scent of damp earth and blooming jasmine. Mr. Vance moved down the narrow gravel path with a brass caliper in hand, measuring the exact width of each orchid blossom and noting the numbers in a leather-bound ledger. "Precision, boy," he murmured without looking back at his apprentice. "A garden is not a poem; it is a ledger of inputs and outputs. If the temperature drops two degrees, the yield fails."

Behind him, Leo stood with his hands deep in his pockets, his gaze fixed on a wild fern that had split the mortar between two bricks, its fronds reaching toward a crack in the glass. "But look at how it thrives where it wasn't planted, Mr. Vance," Leo said, touching a leaf gently. "It didn't need the coal fires or the imported soil. It just wanted the light."

Mr. Vance sniffed, not looking up from his calculations. "That is a weed, Leo. It consumes nutrients meant for the hybrid tea roses. A plant without a designated purpose is merely an irritation."

Leo smiled faintly, watching a drop of water slide down the fern's stem. "Perhaps its purpose is simply to remind us that the glass can be broken."

In the passage, the contrast between Mr. Vance’s rigid measurements and Leo’s appreciation of the wild fern primarily serves to highlight their differing attitudes toward which of the following?