Environmental factors-Sunlight,Proper temperature,Moisture ,Air and nutrients.
This effect the growth of plant.When the plant get enough of all these factors,they grow well.Same in the case of more ripe red tomato.
Genetics-When a plant contain that DNA which contains the gene more strongly which can pass from one generation to another more easily,these are called as more strong gene or dominant gene.
So,the ripe plant have more these strong genes,so they are more grown.
Claim-The plant which getting better environmental and genetic factor are grown better.
Evidence-Based on the question and information given,the unripe plant grows lesser as compared to ripe plants.So,we have to find the evidence for these.
Reasoning-The main reason is genetics,is the presence of Strong gene/Dominant gene .
Environmental factor-Which affects a lot the growth of plant,which are explained above.