True coelom appeared first in the course of evolution in

$A$ student was given a specimen to identify on the basis of the characteristics given below.
$(i)$ They are metamerically segmented.
$(ii)$ Presence of closed circulatory system.
$(iii)$ They have circular and longitudinal muscles for locomotion.
Identify the specimen.

Which option shows the maximum number of correct characteristics for the given figure?

Which one of the following does not have a larval stage in its life cycle?

The first phylum of animals to exhibit a true coelom is:

Which of the following characteristics is $NOT$ found in the phylum $Annelida$?