7)
why was fruit a good crop for the sacramento valley counties of sacramento, yolo, and solano?
a) because droughts kept killing the cattle and other livestock
b) because the water table was high enough not to need irrigation
c) because the people living in those counties did not want to raise cattle
d) because the owners of large ranches had to subdivide and sell their land

B  Because the water table was high enough not to need irrigation

Explanation:

is correct. Paragraph 8 tells about the development of fruit as a crop in the Valley, and clearly states that in these three counties, irrigation was not needed due to a high water table. Nothing was said about cattle in this paragraph, and although owners of large ranches having to sell their land was mentioned, it is in connection with the increase in land values and taxes, not the fruit crops.

taking into account that a theme is the central topic a text treats and can be developed through a story, play, poem etc. the following are themes that can be further developed:  

my best friend jeffrey has many unusual interests. (the story could be about each of the unususal interests)

once a man gives his soul over to evil, he can never go back. (this could be a saying or a proverb)

the three sheepdogs lay around the yard all day. (it could be developed detailing how each of these sheepdogs lay around)

a priest's collar has an unusual effect upon people. (it could be developed detailing the different effect upon people)

innocence is a powerful force in a world full of corruption. (it could be developed detailing how is a world full of corruption)

king lear is a play shakespeare wrote later. (it is just a sentence and doesnt give any idea or topic to be discussed in details.

evil often wears the disguise of innocence. (this could be a saying or a proverb)

is it multiple