Unlike other arachnids, which have their nerve cells evenly distributed along their bodies, the scorpion's nerve cells are clustered in its head, like a mammal's.

A bodies, the scorpion's nerve cells are clustered in its head, like a mammal's
B bodies, the scorpion's head had a cluster of nerve cells, as a mammal does
C body, the scorpions has a cluster of nerve cells in its head, as a mammal does
D body, nerve cells are clustered in the scorpion's head, like a mammal's
E body, a cluster of nerve cells is in the scorpion's head, like a mammal's

Ans is C

Def not B, (head had)
D and E are wrong -- Correct Unlike X, Y blah blah
A and C, X is a collective noun, (arachnids so make it it dogs for understanding the phrase, so unlike other dogs, the german shepard has a black tale.

Should it be german shepards or shepard so scorpion or scorpions
Sec should it be body or bodies
third -should it be like or as.

Thanks
Khurram