The correct answer is cameras
The answer is definitely D.
MIT defines calculus as the study of change, usually in motion.
350,000 .they used as troops.
Much like today, the key entertainment for Elizabethan London was: sports, visual entertainment (plays, for the time), and gambling.
Tennis, in particular, became a particularly popular sport during the Elizabethan age while artists like Shakespeare came to prominence with plays that the common masses enjoyed.
