To find the correct order, we must look at the grammatical role and context of each blank:
Blank (1): Needs an adjective to describe the "conference room." Among the choices, "spacious" (meaning having ample space) fits perfectly to describe the size of a room.
Blank (2): Needs a verb (past participle) to describe what was done to the room with the chairs and tables. "Equipped" (meaning provided with necessary items) is the correct term to use when a room is filled with functional furniture and technology.
Blank (3): Needs a noun to describe the overall "feel" or setting. "Environment" (meaning the surroundings or conditions) fits the phrase "professional environment for meetings."
The completed sentence reads:
"The spacious conference room was equipped with comfortable chairs, sleek tables and advanced multimedia systems for presentations, creating a professional environment for meetings."