The factors that made it difficult for Eastern Europe to improve its water quality were outdated sewer systems, raw water quality, worn-out water utilities and unskilled employees. So we can say that four options given in the question fits the bill perfectly. These basic infrastructural reasons were responsible for being a hurdle towards improving the water quality. <span />
Answer:
a presidential candidate must be a natural born citizen of the United States, a resident for 14 years, and 35 years of age or older.
4th- the right against unreasonalble searches and seizures
5th-<span>No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury
6th-</span><span>In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial
8th-</span><span>Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted</span>
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