Answer: Choice A)
Approximately 0.4 units or about 24 miles approximately
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Step-by-step explanation:
B = Santa Barbara's location
C = Santa Cruz Island's location
Point B is located at (34.4, 119.714)
Point C is located at (34, 119.726)
Use the distance formula to find the distance from B to C

Unfortunately, there isn't enough info to be able to go from 0.4 units to roughly 24 miles, so I don't know how your teacher is doing that step. But luckily, only choice A mentions 0.4, so this has to be the answer.