Question

coordinating conjunctions
b o y f a n s
but or yet for and nor so
they worked all day in the sun and needed to rest.
they worked all day in the sun, and needed to rest.
comma no comma

Explanation:

When using a coordinating conjunction (like "and" here) to connect two verbs (or verb phrases) that share the same subject ("They" in this case: "worked" and "needed"), a comma before the conjunction is not required. The rule is that a comma is used with a coordinating conjunction when it connects two independent clauses (complete sentences), but here "worked all day in the sun" and "needed to rest" are verb phrases sharing the same subject, so no comma is needed before "and".

Answer:

no comma