If your KPI is transactions and your target metric is ‘monthly spend’, then the strategy will attempt:

If your KPI is transactions and your target metric is ‘monthly spend’, then the strategy will attempt:
  A)  To get you the most clicks for your monthly spend
  B)  To get the best ROAS possible across your keywords
  C)  To get the most transactions for your monthly spend
  D)  To get the most high value conversions for your monthly spend