<u>The relationship between goby fish and striped shrimp are truly/A </u><u>symbiotic, for neither</u><u>/B can survive/C without/D the other. No error/E</u>
The correct option is A.
Yes, it should be is.
The sentence is referring to the relationship between the fish, not the fish themselves.
Relationship is singular.
What is symbiotic explain?
Symbiosis, any of several living arrangements between members of two different species, including mutualism, commensalism, and parasitism.
Both positive (beneficial) and negative (unfavourable to harmful) associations are therefore included, and the members are called symbionts.
