According to the author, what is the main obstacle to exploring the ocean depths? Explain why, citing evidence
from the text.

Option B: x ≥ 5 is the correct answer.

Step-by-step explanation:

Given that:

Points needed to obtain high score = 1500 points

Points earned after completing each level = 300 points

Let,

x be the number of levels.

We will use greater than equal to inequality because minimum of 1500 points are needed to obtain high score.

300x ≥ 1500

Dividing both sides by 300

x ≥ 5

You must beat 5 or more levels in order to obtain the high score.

Hence,

Option B: x ≥ 5 is the correct answer.