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This is the same as:
for(int i=0 ; i<100;i++)
;
System.out.println(i);

An empty semi-colon counts as a statement. So the for-loop statement is the empty statement, and System.out.println()...

No, the parser will take only 1 statement (statement A). The other statements are considered outside the for-loop scope, and thus are not executed as part of the for loop.

That's be similar to...

No, a statement can be a line statement or a block statement.

This is perfectly fine code and will print out 0 to 5. However, it is generally considered good practice to wrap statements after...

A for loop must have this syntax (using regex notation where ? means it's optional):
for(expression?; condition?; expression?)
statement

where expression is any valid single expression...