What does a sandworm (Nereis) possess for locomotion?

Which of the following animals possesses a closed circulatory system containing blood capillaries?

Closed circulatory system occurs 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.

Annelids are ..........

An animal with metameric segmentation/metamerism is