Measurements of the extent of amino-acid decomposition in fragments of

The question asks us to identify a conclusion for which the statements offer the most support. We know the following:

1. a technique measuring amino-acid decomposition can be used to date archeological sites in place like South Africa as far back as 200,000 years.
2. because amino-acid decomposition is slower in cooler climates, this technique can be used to date archeological sites in cool climates as far back as one million years.

Answer choice (C) is supported because the technique relies on the rate of decomposition of amino-acids which are affected by climatic conditions. If the climatic conditions have fluctuated and can not be taken into account, then the rate of decomposition would vary during the climatic fluctuations and so cannot be accounted for during the analysis.

Incorrect Answers
(A) is unsupported. The statements do not suggest where the oldest archeological sites are located. It only discusses the effectiveness of using this technique based on climatic conditions.
(B) is unsupported. We know that this technique is used by measuring amino-acid decomposition in eggshells, but the statements do not suggest that this amino-acid decomposition only occurs in eggshells.
(D) is contradicted by the statements. We know that this technique is suitable in cooler climates for dating archeological sites as far back as one million years.
(E) is unsupported. The statements do not suggest where eggshells are more likely to be found.