One who can use either of his hands with ease

Answer: Option C

One word substitute is Ambidextrous.

Amateur: a person who engages in a pursuit, especially a sport, on an unpaid rather than a professional basis.
Expert: a person who is very knowledgeable about or skilful in a particular area.
Ambidextrous: able to use the right and left hands equally well.
Gluttonous: excessively greedy.