Step 1: Think about the word reform.
A reform is a deep and broad change, not a small adjustment to one item.
Step 2: Pull out the evidence.
The passage gives a list of sectors that saw reforms: farming, factories, trade, foreign money and technology, state-run firms and banks.
Step 3: Test the options.
Options 1 and 3 name a single area, so they are too narrow. Option 4 names a single group of gainers, which the passage does not say.
Step 4: Choose.
Option 2 fits the evidence.
Step 5: Why the other options fail.
Option 1 says: They were only related to taxation.. This does not fit the idea we settled on, so it cannot be the answer.
Option 3 says: They changed only the public sector.. This does not fit the idea we settled on, so it cannot be the answer.
Option 4 says: They benefited only multinational companies.. This does not fit the idea we settled on, so it cannot be the answer.
Step 6: Quick check.
Read the chosen option again in full: They restructured all major sectors of the economy.. It agrees with the facts above, and each of the other three options clashes with them. So the answer stays the same after this second look.
Final Answer:
Option 2 is correct.
\[ \boxed{\text{Option 2}} \]