= Solution
{c}
<Gravitational waves> can exhibit <interference>. In <linearized gravity>, overlapping strains add, so coherent contributions can enhance or cancel the measured response. Independent astrophysical sources generally have unrelated phases and average to a stochastic background rather than stable fringes. More plausible coherent paths arise when <gravitational lensing> sends different parts of the same signal to the detector with different delays; fringes require sufficient overlap and coherence. The relevant quadratic radiative <energy flux> contains the cross terms even though the leading wave equation is linear.
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