Final answer:
When a species undergoes an unfavorable drastic change in its environment, it may not be able to adapt and may become extinct. Factors that can lead to species extinction include climate change, habitat loss, and shifts in resource availability and timing.
Step-by-step explanation:
When a species undergoes an unfavorable drastic change in its environment, it may not be able to adapt and may become extinct (C). This is because species need specific traits to survive in a changed environment, and only those individuals with the necessary traits will survive (Survival of the Fittest). Extinctions are part of natural selection, and species that fail to adapt eventually die out. Examples of factors that can lead to species extinction include climate change, habitat loss, and shifts in resource availability and timing.