The amount of insolation received at a place on the surface of the earth depends on several factors. Option 1 suggests that climate affects the amount of insolation, which is partially true. However, climate is a broad and complex concept that encompasses various factors like temperature, precipitation, and wind patterns. Option 2 states that longitude affects insolation, but this is incorrect. Longitude primarily affects the time zone of a place, not the amount of sunlight received. Option 3 correctly identifies latitude as one of the main factors influencing insolation. The higher the latitude, the less direct the sunlight becomes, resulting in reduced insolation. Option 4 mentions altitude, which does have some influence on insolation. Higher altitudes often receive more direct sunlight and may have increased insolation compared to lower altitudes. Overall, option 3, latitude, provides the most accurate explanation for the amount of insolation received at a place.