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Edward Jenner noticed that the milkmaids who milked cows by hand often were infected with cowpox and that their infections were mild. He also noticed that these same milkmaids did not contract smallpox, which was a much more serious disease. He presumed that the cowpox infections prevented the milkmaids from contracting the much more serious disease of smallpox. Subsequently he began vaccinating people with the pus-like material from cowpox lesions to determine if his thinking was correct. In the story above, the underlined portion is a(n):____________
A. Hypothesis
B. Observation
C. Theory
D. Experiment

Respuesta :

Answer:

Hypothesis.

Explanation:

The science mainly deals with the study of the nature and the natural phenomena. Different fields of science are chemistry, biology, physics, geology and maths.

Hypothesis may be defined as the complete explanation of the particular phenomena  mainly on the observation of the individual. A scientific hypothesis can be converted into a theory if tested by the scientific experiments. Here, Edward Jenner based on his observation predicts the hypothesis about vaccination.

Thus, the correct answer is option (A).

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