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What is Most common eye ball tumour is – and explain in detail?
The three most common malignant tumors of eye (intraocular) are malignant melanomona, retinoblastoma and metastatic tumors.
Metastatic tumors are the most common intraocular tumor (more common than any other tumor). However, it is not given in options.
Malignant melanoma is best answer amongst the given options -

"Malignant melanoma is the most common of all tumors that originate in the eye". — Basics of intraorbital tumors
"Malignant melanoma of the uvea is the most common form of primary intraocular malignancy followed by retinoblastoma".  — Therapy of intraocular and orbital tumors