Answer: d. Logging in national parks
Step-by-step explanation:
Conservation efforts are the initiatives that are taken to protect the environment, resources and the biodiversity from illegitimate human activities.
Among the given options, d. Logging in national parks. is the correct option. This is because of the fact that logging is the practice of cutting of trees. This is likely to reduce the population of tree species in the national parks reducing the overall biodiversity. Hence, this practice is against the conservation efforts.