Answer: deceptive pricing
Explanation:
Overall, the answer could be deduced from the defenitions of those terms.
We can surely exclude green washing, which basically means that the product is sold under "eco", "green" label, when it is not. Puffery is a legal practise, which can not be proven to be true or false; which is clearly not the case in this example.
Now we are left with three categories of deceptive marketing practices. Deceptive packaging means that the product does not fit the image peceived from its package. This might be the design, the size, the picture of the product, etc. Deceptive promotion means that the information on the ads is inaccurate, partly withhold, or false. Deceptive pricing means that the seller offers the product at lower price. This can be done by promoting low price for low-in-stock or out-of stock items and then offering the substituent products of the same category, which are surely more expensive.