Topic: Group verb,

Best Answer Explained in Below-:

The phrase "manage without her" implies that Kanon's colleagues had to cope or function amid her absence. Among the options provided, "get along" is the most fitting. This phrase often means to manage or operate in a situation, especially when facing challenges or difficulties. In this context, it implies that her colleagues continued to work harmoniously and efficiently despite her illness.

The other options do not convey the same meaning:

- **A) Get by** typically means to manage to survive or maintain a minimal standard, which could imply a struggle rather than effective management.
- **B) Get through** usually suggests successfully completing a difficult period, focusing more on overcoming difficulties than on maintaining normal operations.
- **D) Get across** refers to communicating or conveying a message, which is irrelevant to the context of coping with someone's absence.

Therefore, “get along” best captures the sense of effectively functioning together as colleagues, maintaining teamwork, and supporting each other during Kanon’s illness.