Mark the letter A, B, C, or D on your answer sheet to indicate the correct arrangement of the sentences to make a meaningful paragraph/letter in each of the following questions.

a. Secondly, environmental pollution from industrial and agricultural activities harms soil, water, and air quality, impacting both ecosystems and human health.
b. Addressing these challenges requires a comprehensive approach, including sustainable land use, pollution control, climate adaptation, and increased awareness of ecosystem conservation.
c. Thirdly, climate change exacerbates these issues, disrupting the delicate balance within ecosystems.
d. Ecosystems in Vietnam encounter significant challenges.
e. Firstly, rapid deforestation and habitat loss due to urbanization and agriculture threaten biodiversity.
f. Moreover, inadequate management and conservation practices further contribute to habitat degradation.