Why, on average, for all comets, their heads reach their maximum size when moving between the orbits of the Earth and Mars?

Apparently, at distances from the Sun 1 – 1.5 AU. the formation of the head is already proceeding quite effectively, and the outflow of matter from the head is still not so great.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.