Cloze Test — quick quiz

Passage: The Reserve Bank of India has been making (1) to promote financial inclusion in rural areas. Digital payment systems have (2) significantly in the past five years, making it easier for farmers to receive government subsidies directly. However, many villages still (3) adequate internet connectivity, which remains a major (4) to the widespread adoption of cashless transactions. The government is now working to (5) this gap by installing more mobile towers in remote regions. Question: Which of the following words best fits blank (2)?