The development of India was marked by thriving creativity in the fields of art, science, literature, and astronomy under the reign of the dynasty. In fact, the period is considered the age of classical India.

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the correct labels are as follows:

a: yellow river

b: himalayan mountains

c: north china plain

d: taklimakan desert

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.