If Yemeni women were allowed to work, the economy of the country ... .would improvewill improveimprovesdidn’t improve

In the context of the question regarding Yemeni women's employment and its impact on the economy, the most appropriate choice would be "would improve." This selection suggests a conditional future outcome – that is, if Yemeni women were permitted to work, it could lead to improvements in the economy due to increased participation in the workforce.

Explanation

Allowing women to work could enhance productivity, diversify the job market, and raise family incomes, which collectively stimulate economic growth. Empirical studies from various countries indicate that women's participation in the labor force contributes positively to GDP. In Yemen's case, given the struggles the economy faces, integrating women into the workforce could provide much-needed resources and perspectives, fostering innovation and revenue generation.

Conclusively, the answer is: would improve.