Selecting candidates by gathering a number of signatures from qualified voters is called .

nomination by signature

direct nomination

nomination by petition

closed nomination

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Explanation:

Selecting candidates by gathering a number of signatures from qualified voters is called nomination by petition

The correct answer is letter "C": nomination by petition.

Explanation:

Nomination by petition is a requirement individuals or small-party candidates must fulfill so they can be considered on the day of the ballot. There is a number set of valid signatures those individuals must present so they can be considered for the ballot. Typically, they will need more signatures than requested since some of the signers may not be eligible for voting, or do not live in the candidate's electoral district.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.