Which structure evolved in finches, allowing them to become insectivorous and vegetarian?

Assertion : Darwin's finches show a variety of beaks suited for eating large seeds,flying insects and cactus seeds.
Reason : Ancestral seed-eating stock of Darwin's finches radiated out from South American mainland to different geographical areas of the Galapagos Islands,where they found competitor-free new habitats.

Select the correct option based on the figure given below.

What does adaptive radiation refer to?

Select the $CORRECT$ statement.

The evolutionary process that gives rise to new species adapted to new habitats and ways of life is called adaptive radiation. Which of the following is an example of this?