Which of the following observations and inferences led Charles Darwin to his theory of natural selection as a mechanism for evolution?

• A. Individuals in a population of any species vary in many heritable traits.
• B. Individuals with heritable traits best suited to the local environment will generally produce a disproportionate number of healthy, fertile offspring.
• C. A population of any species has the potential to produce far more offspring than will survive to produce offspring of their own.
• D. Darwin synthesized his theory of natural selection from all of the listed observations and inferences.