English is my least favorite subject ;-;
D is an example of a declarative sentence
Water is usually a symbol for life because it is so vital to survival.
Ironically, being stranded at sea, you can't drink the boundless surrounding water.
I would say the answer is D. The character is not stranded by choice. They are stuck, unsure how to navigate a way out of the current situation.
The square roots of 576 are +24 and -24.
'Exert' means to apply force on influence over something else, this can be in a negative or positive way. In this quotation, it means that language, if used correctly, has the ability to express a 'hidden power'. It's also worth mentioning that the simile is relevant as the moon has an influence on the level of tides on Earth.