Final answer:
To maximize the Evergreen Environmental Organization's newsletter subscription campaign within their budget, the recommended automated bidding strategy is Target Impression Share bidding. This strategy is most beneficial for increasing ad visibility and potentially driving more newsletter sign-ups, in comparison to ROAS, eCPC, and Target CPA bidding strategies.
Step-by-step explanation:
The Evergreen Environmental Organization is seeking to optimize their newsletter subscription campaign with a strategy that best utilizes their budget. Considering that which automated bidding strategy will help get the most out of the budget, a suitable option would be Target Impression Share bidding. This strategy focuses on maximizing visibility by targeting a percentage of available impressions. This could effectively help boost the newsletter's subscription rate by ensuring that the ads appear more frequently within the constraints of a given budget.
Options like Target Return on Ad Spend (ROAS) are typically oriented towards campaigns with a direct return in revenue which may not align with the goal of increasing newsletter subscriptions. Enhanced Cost-Per-Click (eCPC) bidding adjusts your manual bids with the goal of converting clicks into actions but still requires some manual oversight. Finally, Target Cost-Per-Acquisition (CPA) bidding focuses on optimizing for conversions at a specified target CPA and is less focused on the spending of the full budget.
Overall, Target Impression Share bidding is more aligned with marketing goals that aim to increase visibility, such as growing a subscriber database for newsletters, rather than driving direct sales or specific conversion actions.