What is the meaning of instrument in the sentence below? she was the chief instrument of change in the revolution 2. a tool used in procedures, like surgery 3. a mechanical device used to measure something 4. document related to business, like bond, drafts, etc. 5. a means through which something is done

1) earth's crust is made up of relatively rigid plates that ride atop earth's hot, semiliquid mantle. (2) the plates are called tectonic because they're in constant motion. (3) they can move because earth's mantle is a very hot and semiliquid fluid called magma. (4) volcanoes are a result of magma rising up or erupting through a plate, particularly where plate boundaries are moving against each other. (5) also, when plates slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6) therefore, we often find volcanoes and earthquakes along plate boundaries. (7) plates may also collide. (8) when that happens, mountain ranges are formed. (9) for example, the collision of the plate carrying the indian subcontinent created the himalayan mountains when it collided with the asian plate. which statement about this paragraph is accurate?

He united states can produce 200 pillows in one week, while spain and france produce 150 and 100 pillows, respectively, in one week. on the other hand, spain can produce 10 televisions in one week, while the united states and france produce only 5 and 4 televisions, respectively. has an absolute advantage in producing pillows, and has an absolute advantage in producing televisions.

What does the birdcage symbolize in trifles?