Answer:
1. Likely to occur during economic growth and increase the trade deficit - imports increase
Economic growth increases the living standard of people because it raises the average income. People often use this income to buy goods from abroad in case demand is not met by domestic firms.
2. Likely to occur during economic growth and decrease the trade deficit - d. private savings increase
Private savings increase during economic growth because people enjoy a higher disposable income. A share of this private savings are invested abroad, where foreigners use this capital to import goods from the original country, decreasing the trade deficit.
3. Not likely to occur during economic growth - c. private savings decrease
Private savings usually increase during times of economic growth for the reasons explained above.