After Reading the Paragraph Below, Answer the Questions That Follow

After reading the paragraph below, answer the questions that follow.
To protect U.S. soldiers serving overseas, each soldier receives vaccinations against several diseases, including smallpox, before deployment. Following intelligence about an imminent smallpox threat in Iraq, the U.S. Army wants to ensure that soldiers stationed there are fully protected from exposure to the disease, so all the soldiers in the threat zone are given a second vaccination against smallpox.
-The second vaccination is beneficial because

A) it contains plasma cells that survive longer than 4-5 days.
B) it stimulates production of a higher concentration of antibodies in the bloodstream.
C) it requires two injections to stimulate antibody formation.
D) it keeps previously produced plasma cells circulating in the bloodstream.

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