Concept:
The phrasal verb cast aside means to throw away, discard, dismiss, or reject something because it is considered unimportant, unacceptable, or undesirable.
Step 1: Understand the context.
The sentence says:
\[
\text{"She cast aside the report indignantly."}
\]
The word indignantly indicates that she acted with anger or annoyance.
Step 2: Determine the meaning of the phrasal verb.
Here, cast aside means that she refused to consider the report and dismissed it.
Step 3: Examine the options.
• Rejected -- refused to accept.
• Accepted -- opposite meaning.
• Observed -- merely looked at.
• Irritated -- describes a feeling, not an action.
Step 4: Choose the correct answer.
\[
\boxed{\text{Rejected}}
\]