It is important to learn strategies for determining meanings of unfamiliar words without looking them up in the dictionary. why?
looking up every unfamiliar word in the dictionary increases your reading speed.
you may face certain instances in which a dictionary is not available (such as on standardized tests).
it is not actually important to learn these strategies.

The correct answer is the second one, because it might happen that you do not have a dictionary at hand and you need to know the meaning of an unfamiliar word. So, if you develop some strategies, that will help you immensely. 
The first option is incorrect, because quite the opposite happens - it decreases your reading skills if you have to look up a word every 5 minutes.
And the last option is also incorrect, because those skills and strategies are important.

It’s nurture, they don’t know better nor do they know right from wrong

Atahualpaemperor of the inca empire who rose to the throne after winning a civil war between him and his brother.  -he refused to become a spanish vassal or christian.-francisco pizarro kidnapped him and demanded a huge ransom.  -pizarro's secretary described him as "a man of thirty years, good-looking and poised, somewhat stout, with a wide, handsome, and ferocious face, and the eyes flaming with blood."-after the ransom was paid, atahualpa was killed by pizarro