The Easter Islanders were good builders and managed to erect 30 ton stone statues, doing it without any power source other than their own muscles.


A. managed to erect 30 ton stone statues, doing it without "doing it" clearly refers to "erect", but is redundant - the verb "doing" does not provide any additional information except referring to another verb which is already specified. Eliminate.


B. managed to erect 30 ton stone statues, did it without Same error as in (A). Eliminate.


C. managed to erect 30 ton stone statues, making them while not having "while not having" is simply a wordy way of saying "without". Hold on to this for now - we will eliminate this option if there is a better one later.


D. managed to erect 30 ton stone statues, making do without Correct answer - above errors are rectified and no new errors are introduced.


E. 30 ton stone statues were erected , making them do without "making" refers back to "Easter Islanders", and the only possible antecedent for "them" is also the same noun. This sentence appears to imply that the Easter Islanders made themselves do something, which is incorrect. Eliminate.


Since option (D) is so much cleaner than option (C), we can eliminate option (C).