It seems that the options provided are incomplete, but based on the information from the sources, a suitable transition to synthesize the information could be something along these lines:
"Consequently, the drastic decline in the wolf population, due to widespread efforts in the 19th and 20th centuries, led to a significant increase in the grazing herd numbers, which negatively impacted the environment. However, the return of wolves has not only ecological benefits but also attracts over 150,000 visitors each year, generating nearly $35 million in revenue for the surrounding states."
If the complete set of responses is available, I would be able to identify which specific transition would best connect the sentences.