1)First of all,in first if statement parenthesis are not balanced .so it is Syntax error. there is no option called "syntax error".if we forget the balancing parenthesis we can move further.
2)let consider example
Trail(7,2,6) return 6
Trail(5,4,9) return 5
So from example you can conclude that it dose not return maximum or minimum or middle of element. in another case if a=b=c ,it stuck in infinite loop. so answer is d) None of the above