Discussion
Assertion (A): A tombolo behind a detached breakwater blocks the longshore drift entirely.
Reason (R): The accreted sand connects the shoreline to the structure and interrupts the path.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Once the accretion reaches the structure there is no longer a water path behind it, so the drift cannot pass and the breakwater acts like a shore-connected groyne. That is why a tombolo, though it looks like a success, is often the outcome a designer sets out to avoid: a salient that stops short of the structure gives the shelter without severing the drift.
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