Sentence Correction

1. As a result of the ground-breaking work of Barbara McClintock, many scientists now believe that all of the information encoded in 50,000 to 100,000 of the different genes found in a human cell are contained in merely three percent of the cell's DNA.

a) ...
b) 50,000 to 100,000 of the human cell's different genes are contained in a mere
c) the 50,000 to 100,000 different genes found in human cells are contained in merely
d) 50,000 to 100,000 of human cells' different genes is contained in merely
e) the 50,000 to 100,000 different genes found in a human cell is contained in a mere

i picked c. correct ans- e. explain pls.



2. The number of undergraduate degrees in engineering awarded by colleges and universities in the United States increased by more than twice from 1978 to 1985.

a) increased by more than twice
b) increased more than 2 times
c) more than doubled
d)was more than doubled
e) had more than doubled

i picked a. but correct ans: c. but that just didn't sound right to me. explain pls?

3. The decision by one of the nation's largest banks to admit to $3 billion in potential losses on foreign loans could mean less lending by commercial banks to developing countries and increasing the pressure on multi government lenders to supply the funds.

a)..
b)the increasing pressure
c) increased pressure
d) the pressure increased
e) the pressure increasing

i picked b. but the correct ans: c.however the answer seemed it just doesn't go with 'less lending'.