Which of the following is true about chromosomes?
a. more complex animals have more chromosomes
b. chromosomes are found in many places of the cell.
c. sperm and eggs have half the chromosomes as other cells.
d. some chromosomes do not have dna in them.

C) Sperm and eggs are haploid. All others are diploid.

The answer for this question is letter C. It is true that sperm and eggs have half the chromosomes as other cells.  The sperm and/or the egg cell each only has 23 chromosomes, half of the original number, so that when they join to form a zygote when fertilization occurs, the zygote will have a total of 46 chromosomes, like every cell in a human does.
The others cannot be the right answer for the following reasons:
A - The complexity of an organism dos not depend on the number of chromosomes.
B - Nucleus is the only place where you can find chromosomes.
D - DNA and other proteins makes up the chromosomes.