Which of the Following Examples Best Represent an In-Kind Donation

Which of the following examples best represent an in-kind donation?

A) Amanda, a social activist, donates 1/10^th of her annual income amount to a retirement home in her locality.
B) Stalin, a sales manager at a global consumer electronics firm, contributes $500 in cash toward the medical expenditure of his ailing colleague.
C) Nerden Inc., a food-processing unit, donates relief materials to victims of an earthquake in its country of operation.
D) Niron Inc., an online retailer, contributes 10% of its annual turnover to adopt model villages.