If your watch was made after  it is quartz powered The statement above can be deduced logically from which of the following statement

A     Only if a watch was made after 1972 could it be quartz powered

B     All watches made after 1972 are quartz powered

C    Some watches made before 1972 were quartz powered

D    Some quartz-powered watches are found made after 1972

Solution

Correct Answer: Option B

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