Select the correct active/passive form of the given sentence. **Convert the sentence provided below from its passive voice structure to an active voice structure: The original blueprints had been secured carefully by the engineers before construction commenced.**

Options:

• A: The engineers has secured the original blueprints carefully before construction commenced.
• B: The engineers secured the original blueprints carefully before construction commenced.
• C: The engineers have secured the original blueprints carefully before construction commenced.
• D: The engineers had secured the original blueprints carefully before construction commenced.

Related Practice Questions:

• Which of the following artifacts, extensively found at Burzahom and Gufkral, specifically indicates that the Neolithic inhabitants of Kashmir practiced sewing animal skins for clothing to survive the harsh winters?
• The earliest known evidence of rock art in India, in the form of 'Cupules' (hemispherical cup-shaped depressions carved into rock), belongs to the Lower Paleolithic age and was found at:
• The first human colonization of the fertile Ganga plains, as evidenced by archaeological discoveries at Sarai Nahar Rai and Mahadaha, took place during which period?
• Which prehistoric site located in the Thar Desert of Rajasthan provides a continuous and undisturbed profile of Lower, Middle, and Upper Paleolithic cultures?