The reader can infer the following about the author after reading the passage about birding:
C. Doing some research can help a person identify different birds.
After reading the passage, we can eliminate option A. It claims that the author believes no equipment is necessary for birding experts. However, the author clearly mentions the use of equipment such as binoculars.
We can also eliminate option B. This sentence says that the types of birds in an area do not change. However, the author says birds vary according to the seasons.
Letter C is the correct option. The author does say that research about different traits can be useful in order to identify birds.
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