What is a common mistake when doing laundry with mixed loads?

When doing laundry with mixed loads, several common mistakes can arise, which can lead to undesirable results. Choosing a mixed load can result in color bleeding, where dyes from darker or colored fabrics transfer onto lighter items, causing discoloration. This is particularly problematic if new or non-colorfast items are included in the wash.

Additionally, mixing incompatible fabrics can lead to wrinkling. For example, heavier materials like towels might not dry efficiently alongside lighter fabrics, resulting in creased and wrinkled clothing.

Moreover, when different types of fabrics and materials are washed together, it may also contribute to the development of unpleasant odors. Variability in how fabrics retain moisture can create a breeding ground for mildew if not dried properly, leading to odors that cling to garments.

Therefore, mixing various types of fabric and colors in a single wash not only risks color bleeding but can also cause wrinkles and odors, making "all of the above" the most comprehensive choice reflecting these common issues.