This question is asking for you to use leading indicators to evaluate the state of the economy. So you have to look at what’s going on in the other two indicators (the consumer and the business sector). In this problem, the consumer is showing signs of growth and the business sector is stable, not going up or down much over the months they are showing. Given so, the CB’s action to increase the money supply in this kind of neuteral/slight positive enviornment would be a positive move to continue to improve the economy. Doing so slowly (.12 to .15 to .16), they can get the business sector to grow with more easy cash for investment/business development.
If they said the consumer indicator was going up sky high over the last three months and then the business sector was having double digit month to month growth, then if the CB was increaseing the Money Supply to further fuel the fire, you would expect future inflation and then an economy weakening… but I think that would take longer than the 6-9 months they are asking about here to manifest —unless they gave away cash printing machines to destroy the economy in a few months.