The correct answer is option 'B': Pharyngeal glands.

Chromophil cells are specialized cells found in earthworms. These cells are responsible for producing and secreting certain substances. Let's discuss the different locations where chromophil cells can be found in earthworms:

Pharyngeal glands:
Chromophil cells are primarily found in the pharyngeal glands of earthworms. The pharyngeal glands are located in the pharyngeal region of the digestive system. These glands produce mucus, which aids in lubricating the food and facilitating its movement through the digestive tract. The mucus secreted by the pharyngeal glands contains enzymes that help in the breakdown of food particles.

Lymph glands:
Lymph glands are another important part of the earthworm's anatomy. However, chromophil cells are not found in lymph glands. Lymph glands play a role in the immune system of earthworms, filtering and trapping foreign particles and pathogens.

Blood glands:
Chromophil cells are also not found in blood glands. Blood glands in earthworms are responsible for producing blood cells. These glands are located in segments 4 to 11 of the earthworm's body. They produce different types of blood cells, including red blood cells, white blood cells, and coelomocytes.

All:
The option 'd' states that chromophil cells are found in all of the above locations, which is incorrect. Chromophil cells are specifically found in the pharyngeal glands and not in lymph glands or blood glands.

In conclusion, chromophil cells in earthworms are primarily found in the pharyngeal glands, which are responsible for producing mucus and aiding in the digestion process.