I think the answer is B
cause the marketing cloud is only two type of workflow, so left A or B to select for.
(https://help.salesforce.com/s/articleView?id=sf.mc_ceb_get_started_with_approvals.htm&type=5)
and they need both legal and marketing team to approve it ,so they can't be set in approver role, cause if one team approve the mail will be published, therefore they only can be set as previewer and onlyThe answer B (standard workflow) have that role.

I think the answer is B
cause the marketing cloud is only two type of workflow, so left A or B to select for.
(https://help.salesforce.com/s/articleView?id=sf.mc_ceb_get_started_with_approvals.htm&type=5)
and they need both legal and marketing team to approve it ,so they can't be set in approver role, cause if one team approve the mail will be published, therefore they only can be set as previewer and onlyThe answer B (standard workflow) have that role.

I think the answer is B
cause the marketing cloud is only two type of workflow, so left A or B to select for.
(https://help.salesforce.com/s/articleView?id=sf.mc_ceb_get_started_with_approvals.htm&type=5)
and they need both legal and marketing team to approve it ,so they can't be set in approver role, cause if one team approve the mail will be published, therefore they only can be set as previewer and onlyThe answer B (standard workflow) have that role.