A chemical company must use a new process to reduce pollution. The old process emits $6g$ of sulphur and $3g$ of lead per liter of chemical made. The new process emits $2g$ of sulphur and $4g$ of lead per liter of chemical made. The company makes a profit of $25$ per liter under the old process and $16$ per liter under the new process. No more than $18,000g$ of sulphur and no more than $12,000g$ of lead can be emitted daily. How many liters of chemicals should be made daily under each process to maximize profits?

A$.0$ liters under the old process, $3000$ liters under the new process

B$.2666$ liters under the old process, $1000$ liters under the new process

C$.3000$ liters under the old process, $0$ liters under the new process

D$.2500$ liters under the old process, $1500$ liters under the new process