首先，对于您的问题，我需要先明确几个关键概念。根据中国消防法及相关消防技术规范：

1. 高层民建的防火分区限制：一般而言，高层民用建筑的防火分区面积是有限制的，这是为了确保一旦发生火灾，能够有效遏制火势蔓延，减少人员伤亡和财产损失。

2. 防火分区的划分原则：防火分区应根据建筑的用途、面积、疏散路径等因素合理划分，且每个防火分区的最大允许面积是有限定的。

针对您的问题：

A选项指的是，如果将3100平米的电影院划分为两个防火分区，则不符合消防规范。这个说法是正确的。

解释如下：

:According to the current fire safety codes and regulations in China, for high-rise civil buildings, the maximum area of a single fire compartment is typically restricted to 1500 square meters. This is to ensure adequate fire safety measures and evacuation capabilities within the space.

:If a 3100 square meter cinema is divided into two fire compartments, each compartment would exceed the maximum allowed area of 1500 square meters for high-rise civil buildings. This would indeed be in violation of the fire safety regulations.

:To comply with the fire safety codes, alternative solutions such as increasing the number of exits, enhancing fire suppression systems, or using different construction materials that offer better fire resistance might be considered. However, these solutions would need to be carefully evaluated and approved by the relevant authorities.

总结：

1. 对于高层民建，每个防火分区的最大面积通常为1500平米。

2. 将3100平米的电影院划分为两个分区，每个分区超过1500平米，不符合消防规范。

请您在进行建筑设计和规划时，务必遵守相关的消防法规和技术标准，确保人员安全与建筑合规。如有更具体的问题，建议咨询专业的消防工程师或相关审批部门。希望我的回答能够解决您的问题。