You can use the `GROUP BY` and `COUNT` functions in SQL to achieve this. Here's an example query that should work:

```sql
SELECT B, COUNT(DISTINCT C)
FROM table_name
GROUP BY B;
```

This query groups the rows in the table by the values in column B and counts the number of distinct values in column C for each group. The result will show you how many different values are in column B and how many times each value in C appears for each value in B.

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