he will not die young if he eats his vegetables and stays safe from everything else
Life guards keep watch over areas of water where there is activity, such as pools, oceans beaches, some lakes and rivers (that's not a guarantee). The reason a lifeguard would work at a beach is the same he would work at a pool: to make sure everyone is safe, and to help when help is needed.
A figurative language is defined, "Words or expression with a meaning that is different from the literal interpretation." These examples may help you on solving the problem you need assistance with.
1)All right, the sky misses the sun at night.
2)Her head was spinning from all the new information.
3)The poorest man is the richest, and the rich are poor.
4)I've told you a million times to clean your room!
5)I'm so hungry I could eat a horse.
However, there are types of figurative language such as metaphor, simile, personification, hyperbole, symbolism.
The correct answer is "until".
This is because her opinion changed when she found out what the school would be like. This is why we use until.