Question

1. what led dr. james carroll to eventually suggest that yellow fever is caused by a microbe that is much smaller than bacteria?

a dr. agramonte convinced dr. carroll that yellow fever was not caused by bacteria.
b dr. carroll was unable to detect a yellow fever microbe in his research, which led him to believe the germ was smaller than bacteria.
c dr. carroll used a microscope that allowed him to detect microbes that were previously impossible to see.
d dr. james carroll discovered that yellow fever is caused by a virus that was much smaller than any bacteria.
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Explanation:

Dr. Carroll's inability to detect the yellow fever microbe using methods for bacteria led him to infer it was smaller than bacteria. Option B directly reflects this reasoning.

Answer:

B. Dr. Carroll was unable to detect a yellow fever microbe in his research, which led him to believe the germ was smaller than bacteria.