Given what we know about biological structures, we can confirm that amongst the options listed, the one that most closely resembles the function of the strainer is the cell membrane.
A cell membrane is a barrier that acts as protection and provides mechanical support to a cell. The cellular membrane of a cell is composed of a bilayer of phospholipids, which contain a hydrophilic head towards the interior and exterior of the cell, and a hydrophobic pole directed towards the center of the membrane.
This design allows the cell membrane to be semi-permeable. What this means is that the cell membrane has the ability to allow the passage of certain substances like water and polar ions, while keeping unwanted substances out, much like the strainer described in the question.
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