The question is confusing because the graphic doesn't match the question being asked. Does the question actually use this graphic? Because if it does then your WCA would be negative if you are heading East because you would be crabbing to the left to account for wind coming from the North.
In any case, if you are flying from an area of high pressure to an area of low pressure (as the graphic depicts) without changing your altimeter setting your true altitude will be lower. Remember this simple mnemonic: "High to low, look out below."
However, if the question is as stated WITHOUT the graphic, then heading East with a positive WCA means that the wind is from the South. If this is the case it would be fair to assume from Buy Ballot's law that you are transiting from an area of low pressure to an area of high pressure. In this case then the answer would be your true altitude would be higher.