Final answer:
The b. library media specialist is the best resource for helping the high school English teacher develop interactive message boards and social media activities. They can provide guidance, suggest resources, and offer training.
Step-by-step explanation:
The best resource for helping the high school English teacher develop interactive message boards and social media activities would be the b. library media specialist.
The library media specialist is knowledgeable about technology and can provide guidance on incorporating social media effectively into the unit of study. They can suggest appropriate resources, provide training on using social media platforms, and help the teacher navigate any potential challenges or concerns.