Answer clearly

Assume s=($1, $2, ..., Sn) is a Nash equilibrium startegy profile of a normal form game. Which of the following is FALSE? A. If si assigns strictly positive probability to a pure strategy aj, then aj is a best response to s.; for each player i O B. If si assigns zero positive probability to a pure strategy aj, then aj cannot be a best response to s.j for each player i O C. If aj is not a best response to s.j for a player i, then si assigns zero positive probability to a