Being literal-minded about the afterlife, both royalty and commoners arranged to fill their tombs with household objects, each object a necessity for daily life, ready for use.
A. each object a necessity for daily life, ready for use.
absolute phrase modifiers ...both arranged to fill their tomb with household objects,...., ready for use. What were ready for use - household objects. so good so far. 'a necessity for daily life' modifying each object - singular noun. seems ok sentence
B. all the objects a necessity for daily life, ready for use.
here as in A, use of 'ready for use' is good. next part of the suggests - "a necessity for daily life" modifying all the objects(plural) is not correct..
C. all the objects a necessity for daily life, they are ready for use.
creates a fragment with independent clause- they are ready for use, and has connector with previous clause. both arranged to fill their tomb with household objects,...., they are ready for use
D. every object a necessity for daily life, it is ready for use.
creates a fragment with independent clause- it is ready for use, and has connector with previous clause. both arranged to fill their tomb with household objects,...., it is ready for use.
E. each object a necessity for daily life, was ready for use.
creates a fragment... both arranged to fill their tomb with household objects,...., was ready for use. eventually referring the objects as the noun for verb was. but SV doesn't agree.
A is the answer!