Naina B. answered 12/01/13
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Naina, a versatile tutor
Dear Saori,
The highlighted sentence implies that building of permanent settlements created favorable environment for the development of skills necessary for the growth of towns. That is reflected in statement A and therefore, it is correct.
Statement B says that developed skills and towns were found in earliest permanent settlements. This is antagonistic to the highlighted sentence and therefore, it is incorrect.
Skills were developed after early permanent settlements were established. Statement C implies that skills were developed before early permanent settlements were established and therefore, it is incorrect.
Towns developed after permanent settlements were established and skills were developed; the highlighted statement does not say that conditions for establishment of permanent settlements and development of skills were present in towns as stated in statement D and therefore, it is incorrect too.
Hope this helps.
Saori T.
12/01/13