TOEFL Grammar - find the error

ScottsEnglishScottsEnglish Administrator Posts: 1,301 admin ✭✭✭✭✭✭✭
in TOEFL Test
Find the error in the following sentence:

Dr. Jonas Salk refused to accept his patent for the polio vaccine.
                            A                       B                    C              D

The error is B. He did not patent the vaccine, so he did not possess a patent.

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