Why is it important to have gender (f/m) and number (singular/plural) agreement in Spanish?

Which is the main claim in "say no to library cuts"? a. the most important effects of the library cuts will not be limited to children, senior citizens, or other specific groups. b. the budget cuts at the library also mean the end of the children's story hour. c. according to library director sarah tomlinson, whom i interviewed on may 6, the budget cuts will force the library to discontinue many popular programs and services. d. the funding of the public library should be protected because the library offers important programs and services that benefit the whole community.