Answer:The baker explained to her customer, "On top of this lovely French vanilla cake sit several fondant roses surrounded by a raspberry drizzle."
Step-by-step explanation:
The subject-verb agreement error is the verb 'sits.' Since this verb has to agree with the noun phrase "several fondant roses", the correct form of the verb is 'sit.' With the pronoun 'several', plural verb is always used. Moreover, we can conclude by the noun 'roses' that the verb that goes with it must be plural. We would say that the roses sit - which is a plural form.