Which of the following statements about geographic boundaries is false?
a. geometric boundaries can lead to conflict when they cross or ignore obvious physical boundaries.
b. natural physical forms can create boundaries between states.
c. physical boundaries follow straight, geometric boundary lines.
d. lines of longitude and latitude are used to calculate straight boundary lines.

The false statement is the following one:
c. Physical boundaries follow straight, geometric boundary lines.

For example, rivers often form boundaries between the states - including between Mexico and the United States- and then those boundaries follow the course of the river, which is rarely a straight line.

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