Answer:
C. ...
Step-by-step explanation:
The ellipsis (indicated by three dots) is used to show that a thought is unfinished. Therefore, it would fit this situation, where we need to show that "information is missing in the passage."
A bracket is generally not used in English. The colon is used before a list, or to show cause and effect. The forward slash is used to show that either of two words can be put in the same place (e.g. and/or). The semicolon is used to adjoin two related independent clauses.