He found a lucrative assignment.

The correct answer is B.

A lucrative assignment is one that is profitable or pays well. It is an assignment that is likely to bring in a lot of money.

The other options are not as accurate descriptions of a lucrative assignment.

• A good assignment is one that is enjoyable or satisfying.
• An excellent assignment is one that is of the highest quality
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  or standard.
• A significant assignment is one that is important or has a major impact.

While these assignments may be all of these things, they are not necessarily profitable or well-paying.