The author explains the trend of gift-giving on the occasion of holidays, birthdays, anniversaries, weddings, graduations and baby showers. The previous question asks why people value gift-gifting.
People value gift-giving because it offers a powerful means to build stronger bonds with one's closest peers.
The answer lies in lines 10-13 which says 'Many relish the opportunity to buy presents because gift-giving offers a powerful means to build stronger bonds with one's closest peers'.
Thus, option A is the correct answer as gift-giving serves to strengthen a relationship.