Production function input includes human capital, which means option B is the right answer.
The four main factors of production are divided into four categories which are namely land (space on ground on which raw material can be produced), labor (workforce), capital (money or investment) and entrepreneurship (human resource who works to effectively use the other factors). These factors are the main inputs to any production process. Gross domestic product refers to the value of final goods (machinery, automobiles, textiles etc.) and services (telecommunication, healthcare, education, transportation etc.) produced in a country in a given financial year. Rising GDP is the signal of a country's progress economically. Fixed inputs are crucial in determining the firm's maximum output capacity.
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