Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

a. Infrastructure has also improved, with better transportation networks connecting Thai Nguyen to key economic regions.
b. Thai Nguyen province has seen remarkable development in recent years.
c. However, challenges such as environmental concerns and maintaining sustainable growth remain pressing issues.
d. The province is home to large industrial parks, attracting significant investment from both domestic and international businesses.
e. Additionally, the local government has focused on boosting tourism by promoting cultural and natural attractions.