Radiocarbon dating of fossils taken from

suggests at least a portion of the area to have remained.choices (d) and (e) change the meaning of the sentence.according to the original (which ALWAYS determines the meaning, unless it's total nonsense), the radiocarbon dating suggests THE FACT THAT part of the area remained ice-free.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.Other corrections must be made to account for the proportion of throughout the biosphere (reservoir effects).Is it because of "during the last ice age", which is in the past tense? The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.

Whenever a verb expresses an order, request, demand or proposal - we use "verb" "that" "bare infinitive".

Measurement of radiocarbon was originally done by beta-counting devices, which counted the amount of beta radiation emitted by decaying atoms in the sample and not just the few that happen to decay during the measurements; it can therefore be used with much smaller samples (as small as individual plant seeds), and gives results much more quickly.

The development of radiocarbon dating has had a profound impact on archaeology.

Option C follows the rule, but I'm confused about the use of "remained" - which is a past participle.

I thought that we should have used a bare infinitive "remain".

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