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Answer:
   C.  25/6 ft²
Step-by-step explanation:
Let's call the dimensions of Rectangle B x and y. Then ...
   xy = 5 ft²
and 
   x² = 6 ft²
We want to find the value of y². Solving the first equation for y, then substituting for x², we have ...
   y = (5 ft²)/x
   y² = ((5 ft²)/x) = 25 ft⁴/x² = 25 ft⁴/(6 ft²)
   y² = (25/6) ft² . . . . . . . matches choice C