Question

alternative options such as joining the euro zone or creating a new currency are seen as more expensive and potentially riskier.
in this sentence, alternative means:
productive or conducive to producing in abundance
preventing much or all from being included
necessitating a choice between different possibilities
organized and maintained as a legal business firm

Explanation:

The word "alternative" in the context of having options like joining the euro - zone or creating a new currency implies a situation where a choice between different possibilities is needed. The first option about being productive is not related to the concept of options. The second option about preventing inclusion is also off - topic. The fourth option about a legal business form has no connection to the meaning of "alternative" in this sentence.

Answer:

necessitating a choice between different possibilities