As computer security systems become even more advanced, ________the methods of those who try to break into them illegally.
句意：电脑安全系统更加先进，而非法入侵电脑安全系统的方法也变得更加先进了。“so+助动词+主语”结构，表示“……也是如此”。too为副词，表示“也”。因此，本题的正确答案为A。