答案：C

解析：

Choice C is correct. Using the information provided in the table, we find:

The total number of Gupta flies sampled in 2001 is 2604+2681+2640=7925.

The number of Gupta flies that were sampled in either the Botanical Garden or Farroupilha Park is 2604+2681=5285.

The probability that one of the sampled Gupta flies in 2001 was found in either the Botanical Garden or Farroupilha Park is the ratio of the number of Gupta flies sampled in these two parks over the total number of Gupta flies sampled in 2001. Calculate this ratio as a percentage: Probability=5285/7925≈0.67=67%

Therefore, the probability that one of the sampled Gupta flies in 2001 was found in either the Botanical Garden or Farroupilha Park is approximately 67%.