B is a general statement. B will be the first in the sequence.
B states that the body (white blood cells) tackles through two broad attack when a virus barges into the body.
Notice that although “white blood cells” are not explicitly mentioned in C but C talks about how B cells and T cells dish out attacks (in two different forms of attacks, as mentioned in B).
Therefore C follows B.
D ends with “take antibodies” and A talks about how antibodies how they are not the only way to fight an infection.
Therefore, A follows D.
Therefore the sequence is BCDA.
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