Select the option that is nearest in meaning to the underlined word. She undertook a reconnaissance of the entire issue.

Step-by-step solution

Reconnaissance: military observation of a region to locate an enemy or ascertain strategic features. - preliminary surveying or research Investigation: the action of investigating something or someone; formal or systematic examination or research. Revaluation: the action of assessing the value of something again. Ratification: the action of signing or giving formal consent to a treaty, contract, or agreement, making it officially valid. Here, 'investigation' is thus the nearest in meaning with the given word 'Recon