Vestigial organs are those that have lost their original function over the course of evolution. They are remnants of structures that were once useful in ancestral species but have become non-functional or have a reduced function in present-day organisms. In humans, there are several vestigial organs that can be identified.

The correct set of vestigial organs among the given options is:

d) Vermiform appendix, ear muscles, and coccyx.

Let's discuss each organ in detail:

1. Vermiform appendix:
The vermiform appendix is a small, finger-shaped pouch located at the junction of the small and large intestines. In humans, it is considered a vestigial organ because its original function, which was likely related to digestion in our herbivorous ancestors, is unclear. The appendix is now known to have a role in the immune system, but its removal does not have significant adverse effects on health.

2. Ear muscles:
Humans possess a set of small muscles in the ear called the auricular muscles. These muscles were once used by our ancestors to move their ears in response to sounds, much like other animals. However, in humans, these muscles are largely non-functional and do not contribute significantly to our ability to move or control our ears.

3. Coccyx:
The coccyx, commonly known as the tailbone, is a small triangular bone at the base of the vertebral column. It is a remnant of the tail that our mammalian ancestors had. Over time, as humans evolved and the tail became unnecessary, the coccyx became reduced in size and lost its original function. It now serves as an attachment site for muscles and ligaments but does not have a functional tail-like structure.

In conclusion, the set of vestigial organs among the given options is the vermiform appendix, ear muscles, and coccyx (option d). These organs have either lost their original function or have reduced functionality in humans compared to their ancestral counterparts.

Vermiform appendix , ear muscle or ear pinna and coccyx or tail bone are vestigial organ given in ncert