If a number is to be randomly selected from set \(A\) above and a number is to be randomly selected from set \(B\) above

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\(A = \{-10, -9, -8, -7, -6, -5, -4\}\)
\(B = \left\{-\dfrac12, -\dfrac13, -\dfrac15, 0, \dfrac15, \dfrac13, \dfrac12\right\}\)

If a number is to be randomly selected from set \(A\) above and a number is to be randomly selected from set \(B\) above, what is the probability that the product of the two numbers will be a negative integer?

A. \(\dfrac{8}{49}\)

B. \(\dfrac{12}{49}\)

C. \(\dfrac{13}{49}\)

D. \(\dfrac{18}{49}\)

E. \(\dfrac{21}{49}\)

Answer: A

Source: GMAT Club Tests