Select the word that means "giving the best possible profit or benefits in…

A word must be matched to a definition through its core meaning and its grammatical role. Here the definition describes an adjective that evaluates the benefits obtained relative to the money spent.

Context can confirm the match: when a passage connects an activity with affordability, efficiency, or value for money, it points to a cost-benefit description rather than to growth, artistic arrangement, or spreading an idea.

Application

The phrase "giving the best possible profit or benefits in comparison with the money that is spent" defines something that produces worthwhile results for its cost. In the passage, street theatre is described as economical and flexible, so "cost-effective" carries precisely this meaning.

Contrast

• Proliferation is a noun meaning a rapid increase or spread in number.

• Cost-effective is an adjective meaning that good results or benefits are obtained for the money spent.

• Choreography is a noun meaning the design or arrangement of dance movements.

• Propagate is a verb meaning to spread, promote, or reproduce something.

Result

Therefore, the word that matches the given definition is "Cost-effective".