The author in the given passage explains the trend of gift-giving on the occasion of holidays, birthdays, anniversaries, weddings, graduations and baby showers.
The graph in the passage explains the predictions that how much a gift will be appreciated. These predictions are made based on the monetary value of the gift. Y-axis shows the appreciation level while X-axis shows the predictions of gift-givers and receivers based on the monetary value of the gift.
Thus, option B is the correct answer.