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Read the passage and then answer the question.
Edward Jenner (1749-1823)
Edward Jenner was a keen observer of nature from an early age. This would come in handy in guiding his life's work.
Jenner was born in England in 1749. He studied medicine and became a respected surgeon. During Jenner's time, a disease called smallpox was a leading cause of death. Scientists understood this was caused by a virus; however, no one knew how to prevent it from spreading. Jenner noticed a similarity between symptoms of smallpox and another disease called cowpox. However, cowpox did not hurt humans. Jenner gave his gardener's son a shot containing a small amount of cowpox virus. Six weeks later, he gave the same person a shot containing smallpox virus. The person did not become sick. The first vaccine had been discovered!
What trait helped Edward Jenner succeed in his most important life's work?
A. His refusal to quit when the going got rough
B. His stubbornness
C. His powers of observation
D. His dedication to his wife and family