$A$ market with $3900$ operating firms has the following distribution for firms arranged according to various income groups of workers. If a histogram for the above distribution is constructed,the highest bar in the histogram would correspond to the class:
Income group No. of firms $150-300$ $300$ $300-500$ $500$ $500-800$ $900$ $800-1200$ $1000$ $1200-1800$ $1200$
| Income group | No. of firms |
| $150-300$ | $300$ |
| $300-500$ | $500$ |
| $500-800$ | $900$ |
| $800-1200$ | $1000$ |
| $1200-1800$ | $1200$ |
- A$500-800$
- B$1200-1800$
- C$800-1200$
- D$150-300$
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