To determine which of the given products is rational, we need to evaluate each option:
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\( 12 \cdot \pi \):
- \(\pi\) is an irrational number. Therefore, \(12 \cdot \pi\) is also irrational.
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\( 8 \cdot \sqrt{25} \):
- \(\sqrt{25} = 5\), which is a rational number, so \(8 \cdot 5 = 40\) is rational.
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\( 12 \cdot 5.3420941... \):
- The number \(5.3420941...\) appears to be a non-terminating decimal, which suggests it is irrational. Hence, \(12 \cdot 5.3420941...\) is likely irrational.
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\( 10 \cdot \sqrt{8} \):
- \(\sqrt{8} = \sqrt{4 \cdot 2} = 2\sqrt{2}\). Since \(\sqrt{2}\) is irrational, \(10 \cdot 2\sqrt{2} = 20\sqrt{2}\) is also irrational.
Thus, the only rational product is:
\( 8 \cdot \sqrt{25} = 40 \).