Final answer:
The purpose of the GoFundMe account, mentioning that it is established to collect funds for the specific purpose of buying more cards. Therefore,the correct Option is Option D. It is set up to collect money so they can buy more cards.
Step-by-step explanation:
The sentence "It is set up to collect money so they can buy more cards" directly addresses the purpose of the GoFundMe account, which is to raise funds for purchasing additional cards. This statement provides a clear and concise explanation of the teens' objective.
The other options either discuss the general uncertainty caused by the spread of the coronavirus (Option A), the teens sending cards to hospitals (Option B), or relying on friends and family for support (Option C), but none explicitly state the purpose of the GoFundMe account. Therefore, the chosen sentence is the most relevant in explaining why the teens initiated the fundraising campaign.
Therefore,the correct Option is Option D. It is set up to collect money so they can buy more cards.