Declines in real GDP from one year to the next are likely to result in declines?

The answer is e. The other four, measured on an aggregate level, are real variables. If real GDP slows down, aggregate income will decline by definition. The standard of living on a whole will decline. Employment will drop, which will lower employment opportunities. However, nominal GDP could still go up, as the decline in real GDP would probably be a result of inflation, thus causing nominal to be inflated due to higher prices and not to higher output.