Discussion
Compilation time and quality of generated code are related in that
Answer: C
Correct answer: more thorough optimisation generally costs more compilation time
Optimisation requires analysis, and the more thorough analyses are expensive - data flow over the whole flow graph, interprocedural work, repeated passes as one transformation exposes another.
That is precisely why compilers expose levels rather than a single setting: a developer compiling repeatedly wants speed, and a release build can afford minutes. The relationship is a trade, not an independence, and certainly not the inverse the last option suggests.
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