I think this would be a quixotic project for me.

Answer: Option D

Quixotic : extremely idealistic; unrealistic and impractical.
Wasteful : (of a person, action, or process) using or expending something of value carelessly, extravagantly, or to no purpose.
Profitable : (of a business or activity) yielding profit or financial gain.
Fantastic : extraordinarily good or attractive.
Practical : of or concerned with the actual doing or use of something rather than with theory and ideas.

Antonym of Quixotic is Practical