Final answer:
The true statement is 'd) Neither A nor B'. Aneuploidy for sex chromosomes is more tolerated than aneuploidy for autosomes, and polyploidy is more common in plants than in animals, making both statements a and b incorrect.
Step-by-step explanation:
The correct answer to the question is d) Neither A nor B. Statement a) is incorrect because aneuploidy for sex chromosomes in humans is generally more tolerated than that for autosomes. For example, conditions such as Turner syndrome (monosomy X) and Klinefelter syndrome (XXY) can result in living individuals, whereas autosomal aneuploidy often results in developmental failure to birth. Statement b) is incorrect because polyploidy is actually more common in plants than in animals. Polyploid plants often display benefits such as increased size and robustness, whereas polyploid animals are rare and often sterile due to difficulties during meiosis.