D. They thought there was a chemical weapons factory there.
Explanation:
In 1998, the US government attacked a factory in Sudan because they believed that it was a chemical weapons factory that had ties with Osama Bin Laden. However, there was no evidence of this and it was a factory that produced medicines. According to this, the answer is that the US government launch missiles into Sudan in the late 1990s because they thought there was a chemical weapons factory there.
