Which statement best explains how the astrolabe made voyages of exploration possible?
a. it kept crews from getting sick.
b. it sailors steer around rocky coasts.
c. it allowed sailors to know their north-south location.
d. it aided navigators in predicting the weather.

c. It allowed sailors to know their north-south location

Explanation:

The astrolabe is an instrument that is used for the calculation of the astronomical values and is thus used to show the direction and the navigation purposes and hence it determines the latitude and altitude on the land and the seas. And are useful for the time and the calendar conversion of the day and the night.

May consider a group  g=({0,1},+)g=({0,1},+)where  ++  will work as the xor operator like we work in boolean algebra. note here, that ‘00’ and ‘11’ are not the usual 0 and 1 that we work with everyday. the elements are  called  ‘00’ and ‘11’ and  may not mean  zero (nothing) and one (single). ‘00’ is the identity for the given binary operator +, meaning that any element operated with ‘00’ gets us that element itself.  for a set  ss  in  g′g′  having more elements than just  {0,1}{0,1}  the values for  a+b∈sa+b∈s, such that  a∈s,b∈sa∈s,b∈s, have to be first defined, only then can you determine the value of  1+11+1. the answer could possibly have been  22  if oanswer is25,000