First statement is wrong,

• GDP will not decrease, if Linda takes care of her son at home instead of sending him to a day care. Because the imputed value of care services is not included in the GDP. It may lead to underestimation of GDP but not a decrease

second statement is right,

• capital income like rise in the value of assets and investments is not part of GDP because there is no actual production of goods or services.

third statement is wrong,

• Because income per worker is the same concept as income per capita, which means The level of income divided by total population

fourth statement is wrong,

• An increase in import would reduce the GDP because it will lead to outflow of income to foreign countries to pay for the import bill.
• However an increase in export would increase the GDP