The answer is D) While . Transition words are used to connect one idea with another.
Answer:
D) while
Explanation:
Transition words are those that establish relations of meaning between expressions, phrases, sentences or paragraphs. In this case, the word "while" makes a transition that establishes a meaningful relationship between the phrase "many elders are engaged in activities such as religious groups and voluntary organizations" and the phrase "others remain isolated from the community."