请高手帮忙解析下这句英语
这来自一则VOA新闻的句子：
If Iran's nuclear program had not been at least capped, it was making progress that would have crossed Israel's red lines, I think, by next summer, and we very well could have had a military option being exercised.
这句话请原谅我几乎没看懂,at least capped, making progress, very well, had a military option being exercised…… 这些都是什么意思?

请好心的高手帮忙详细解析一下这句子吧,谢谢大家了!