Answer:
Option B,
![3.27](https://img.qammunity.org/2020/formulas/mathematics/middle-school/my9f0s2478dxp5vnkclm7gmp2w8gy3fu2t.png)
Explanation:
Given -
The submerged vessel travel horizontal distance above the shipwrecked hull
![= 400](https://img.qammunity.org/2020/formulas/mathematics/middle-school/8nzlo8vexoqyn0htehnr4mq1jflkk11iak.png)
kilometers
The vertical distance from the the shipwrecked hull to the ground is equal to
kilometers
There forms a right angled triangle with
Base
kilometer
Perpendicular
0.4 kilometer
Tan (angle)
![= (Perpendicular)/(Base)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/g6uxja8gn4q46eu3mzp4j7pyh85rzqotiv.png)
Substituting the given values we get -
Angle of depression
![= tan^(-1)((0.4)/(7))\\= 3.27](https://img.qammunity.org/2020/formulas/mathematics/middle-school/7rucz3w31t21x8t9c9ahcnygg9016h4zio.png)
Hence, option B is correct.