Answer:
Answer is D
9
Step-by-step explanation:
It is a zero-sum game whereby one's victory could only be probable if another's defeat by the same quantity; hence, the net result from the game is negative.
There are three elements – rock, paper, and scissor. 
2 players in the game – 1 and 2. 
So each payer's number of tactics is as follows:
Number of strategies =

=
 
 
= 9
so the answer is 9