Looks like this one got a bit ignored. Can I stir things up with the OA?
Difficulty Please:Below 600
In A, though “which” correctly modifies the noun “cells” but alters the meaning. Also “made from” is incorrect idiom. The correct form of idiom is “made of”. A is not parallel also. B is same as in A, “which” in B correctly modifies the noun “cells” but the verb is mismatched. “which” refers to plural noun “cell” and require plural verb contain. The use of “That” in C is not correct after a comma to correctly modify the noun “cells”. Without “which’, the sentence becomes a run-on in D. In E, the correct choice, "each of which” clearly makes the expression more clear and unambiguous. “which” refers to “cells” and “each” clarifies that every cell contains a positive electrode made of lead dioxide and a negative electrode of metallic lead.
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