How do park officials plan to help save the hemlock trees?

A. They will plant more hemlock trees along the creek beds.
B. They will release beetles that feed on adelgids into the environment.
C. They will cover the trees with a white woolly substance to protect them.
D. They will use needles to pump more sap into the trees.

To understand how park officials plan to help save the hemlock trees, let's analyze each option:

A. They will plant more hemlock trees along the creek beds.
Planting more hemlock trees could be a conservation effort, but it doesn't directly address the problem facing the existing hemlock population.

B. They will release beetles that feed on adelgids into the environment.
This option seems plausible since adelgids are known to cause damage to hemlock trees. Introducing adelgid-eating beetles can help control the population of adelgids and protect the hemlock trees.

C. They will cover the trees with a white woolly substance to protect them.
Covering the trees with a white woolly substance does not directly address the issue at hand. It might be a method to prevent pests or other threats, but it may not be specifically aimed at saving the hemlock trees.

D. They will use needles to pump more sap into the trees.
Using needles to pump more sap into the trees is not a standard conservation technique for saving hemlock trees. It seems unlikely that this would be an effective method.

Based on the analysis, option B seems to be the most viable answer. Park officials planning to release adelgid-eating beetles would directly target the problem, helping to save the hemlock trees.