**Solution: Choice D is correct**

Since, the daily production of cellular phones c is more than 500,000.

This will result is a greater than inequality.

Therefore, c > 500,000.

Also, the daily production of laptops l is more than 300,000.

This will also result is a greater than inequality.

Therefore, l > 500,000.

Also, it is given that the maximum manufacturing capacity of company,

Including both cellular phones and laptops combined is no more than 950,000.

Therefore, this will result in an less than equal to inequality.

Hence, c + l ≤ 950,000.