Final answer:
During a recession, plasma screen and LCD TVs, with a high income elasticity of +4.2, will most likely suffer a decline in demand as they are considered luxury goods.
Step-by-step explanation:
The goods that are likely to suffer a decline in demand during a recession are those with high income elasticity of demand. This coefficient measures how much the quantity demanded of a good responds to a change in consumers' income.
Among the options presented, plasma screen and LCD TVs, with an income elasticity of +4.2, are considered as luxury goods and thus, are more likely to see a significant decrease in demand during a recession. This is because as incomes fall, spending on luxury goods which are not necessities, is often greatly reduced.