Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage

V. Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage. (1,5 points)
Environmental pollution is one of the (23) serious problems facing humanity today. It causes global warming
the amount of land available
illness,
our naturally beautiful world. Everyone wants
destruction of the ozone layer, and the other potentially disastrous processes. Badly polluted air can (24)
and even death. Polluted water kills fish and other marine life. Pollution of soil (25)
for growing food. Environmental pollution also brings ugliness (26)
to reduce pollution. But the pollution problem is as complicated (27)
it is serious. It is complicated as much
pollution is caused by things that benefit people. For example, smoke from cars causes a large percentage of all air
pollution. But cars provide (28) for millions of people.
23. A. more
B. much
B. causing
C. many
D. most
D. to cause
24. A. caused
25. A. reducing
26. A. for
27. A. because
28. A. goods
B. reduces
B. with
B. since
B. jobs
C. cause
C. reduced
C. up
C. as
C. transportation
D. to reduce
D. to
D. all are correct
D. health