Among farmers, most of the reported problems encountered

Among farmers, most of the reported problems encountered with irrigation water stems from an excess of certain micro nutrients—compounds also found in rainwater, soil, and liquid mineral supplements that are necessary for proper plant growth but are toxic in immoderate amounts.

(A)stems from an excess of certain micro nutrients—compounds also found in rainwater, soil, and liquid mineral supplements that
(B) stems from an excess of certain micro nutrients—compounds that are also found in rainwater, soil, and liquid mineral supplements, and they
(C)stem from an excess of certain micro nutrients—compounds also found in rainwater, soil, and liquid mineral supplements, and
(D) stem from an excess of certain micro nutrients—compounds that are also found in rainwater, soil, and liquid mineral supplements and that
(E)stem from an excess of certain micro nutrients—compounds also found in rainwater, soil, and liquid mineral supplements, and they


Although, according to several studies, the costs of treating acute otitis media (AOM) episodes amounts to a sum higher than 2 percent of the estimated $3 billion the nation spent on illness last year, doctors say that these costs can be mitigated if parents take preventative measures for their children.

(A) amounts to a sum higher
(B) amounts to greater
(C) amounted to greater
(D) amounted to higher
(E) amounted to a higher sum