Explanation: According to the Salesforce documentation, the option that adheres most closely to email sending best practices is: B) Establish a consistent, predictable cadence for your email communications. Email sending best practices are guidelines that help users to create and send effective and engaging emails to their prospects and customers. Email sending best practices can cover different aspects of email marketing, such as content, design, deliverability, and performance. One of the email sending best practices is to establish a consistent, predictable cadence for your email communications, meaning that you should send your emails at regular intervals and frequencies, and that you should align your email sends with your audience’s expectations and preferences. By establishing a consistent, predictable cadence for your email communications, you can build trust and loyalty with your subscribers, increase your open and click rates, and avoid spam complaints or unsubscribes. When possible, sending emails on Monday mornings in order to stay top of mind throughout the week, sending plain text only emails in order to increase engagement rates, or making sure that all emails have a high image-to-text ratio are not the options that adhere most closely to email sending best practices, as they are either ineffective, outdated, or detrimental options for email marketing.