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Use the table to answer the question.
In 1928, Frederick Griffith injected four groups of mice with different strains of the bacteria, Streptococcus pneumoniae. The smooth strain had a polysaccharide capsule that protected the bacteria from the mouse's immune system. The rough strain did not have this capsule. The details of each group and the results of the experiment are shown in the table below.
| Bacteria | After injection with bacteria
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Group 1 | smooth strain | mice died
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Group 2 | rough strain | mice survived
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Group 3 | heat-killed smooth strain | mice survived
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Group 4 | rough strain mixed with heat-killed smooth strain | mice died
Which conclusion about Group 4 is MOST strongly supported by the results of the experiment?
A. A virus carried DNA from the smooth strain to the rough strain.
B. The rough strain took in DNA from the heat-killed smooth strain.
C. The rough strain developed a genetic mutation during binary fission.
D. The smooth strain transferred DNA to the rough strain through conjugation.
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