Read the following context and choose the best option to answer the question.
Context: In reality there are very little ways for these companies to reduce their overheads . After the payroll fuel is the biggest expense . There are very few ways for them to reduce their these overheads . Small companies will even find this harder than the bigger companies .
Question: What is overhead ?
Options: 
A. Air space
B. sky
C. Sliding above doors
D. None of the above choices .


D