Since the seventeenth century, the orchestra has a. decreased in size. b. remained exactly the same. c. included instruments of the string family exclusively. d. grown in size.

D. grown in size.

Explanation:

Demands for new styles and experimantation during the Romantic  period account of orchestras becoming larger and incorporating new instruments.

Romantic orchestras had as many as 100 players or more, and featured greater use of brass and piano. Because of tendencies associated to Romaniticism the expansion of orchestra took place (those elements pertaining to form, key, instrumentation and the like) within a typical composition, and the growing idiosyncrasies and expressiveness of the new composers from the new century, it thus became easier to identify an artist based on his work or style.

Symphony orchestra is the largestst set of instruments and contemporary incorporates new instruments, as a search for innovation happened,some may focus on the unique production of sounds by individual instruments.

The modern symphony orchestra varies in size, but typically has a strength of about 100.

Instruments permanently used:

Strings, which contain some 60 to 70 players. This typically comprises some 16 first and second violins, 14 violas, 14 cellos and 8 - 10 double basses.

2 flutes, a piccolo, oboes, one cor anglais, two clarinets, 1 bass clarinet, 2 bassoons and a double bassoon. Then there is the brass, which normally consists of 2 trumpets, 3 trombones (2 tenor and 1 bass), a tuba and 4 horns.

See Below the comparison of a initial baroque style orchestra and a modern one.

b) the importance and limits of political power.

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.