Natural selection drives adaptation through survival advantages in the environment

Steps:

• Define natural selection as the process where traits enhancing survival and reproduction become more common over generations due to environmental pressures.
• Examine each option to determine if it results from differential survival in nature versus human intervention.
• Identify the option involving a trait that confers a survival edge against a natural-like threat without direct human breeding.
• Confirm the match based on evolutionary principles.

Why C is correct:

• Insecticide resistance arises via natural selection, as mosquitoes with genetic variations allowing survival against chemicals reproduce more, per Darwin's principle of differential survival and reproduction.

Why the others are wrong:

• A: Friendly dogs result from artificial selection through human breeding for companionship.
• B: Seedless grapes stem from artificial selection or hybridization by farmers for convenience.
• D: Pleasant-tasting onions arise from artificial selection in agriculture for human preference.

Final answer: C