Option 1 -> Flourishing means thriving or prosperous, indicating financial success and stability - the opposite of being insolvent.
Option 2 -> Bankrupt is a synonym of insolvent (both mean unable to pay debts), not an antonym.
Option 3 -> Soluble means capable of being dissolved or solved, unrelated to financial status.
Option 4 -> Modest means humble or moderate, which has no connection to financial solvency.
Hence, Option 1: Flourishing -> Insolvent means unable to pay debts or lacking funds, while flourishing indicates prosperity and financial health, making them perfect antonyms -> correct