Consider the following:

1. Cashew

2. Papaya

3. Red sanders

How many of the above trees are actually native to India?

The correct option is Only one.

Let us analyze the origin of each of the trees mentioned in the question to determine which ones are native to India:

1. Cashew (Anacardium occidentale):
The cashew tree is native to northeastern Brazil. It was introduced to India (specifically Goa) by Portuguese explorers in the 16th century, primarily to help control soil erosion. Therefore, it is not native to India.

2. Papaya (Carica papaya):
The papaya is native to the tropical regions of the Americas, specifically Mesoamerica (modern-day southern Mexico and Central America). It was introduced to India by the Spanish and Portuguese during the early 16th century. Therefore, it is not native to India.

3. Red sanders (Pterocarpus santalinus):
Also known as Red Sandalwood, this tree is endemic to India. It is native to the southern parts of the Eastern Ghats mountain range in South India (primarily restricted to the forests of Andhra Pradesh). Therefore, it is native to India.

In conclusion, out of the three trees listed, only Red sanders is native to India.