A student who has been shrunk to a size small enough to be inserted into the interior of a chloroplast, who then travels out into the cytosol, will have passed through two plasmatic membranes.
The student in question is placed in the interior of a chloroplast. The anatomy of a chloroplast, in broad terms, contains:
These contents have been listed in order from the most interior to the most superficial. The question states that the student is placed in the granum, meaning that he is within the inner membrane. In order to escape into the cytosol, which lies just beyond the outer membrane, he must travel across two plasmatic membranes.
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