Datasets:
| A village of 12 houses has four straight streets and four circular streets. The map shows 11 houses. In each straight street there are three houses and in each circular street there are also three houses. Where should the 12th house be placed on this map? | |
| A: On A | |
| B: On B | |
| C: On C | |
| D: On D | |
| Answer: D | |