The correct option is A Etaerio of achenes
The fruit in a strawberry plant is formed of several dry and indehiscent fruitlets embedded in a fleshy thalamus. The name of the fruit is decided on the nature of the fruitlets, which in this case is achenes. In the same way, the fruitlets in Etaerio of berries, etaerio of follicles and etaerio of samaras are berry, follicles, and samaras. So, the correct answer is 'Etaerio of achenes'.