请问这个知识点是在哪儿？

问题如下：

Howard Quarries has recently opened a limestone quarry at a location outside their traditional service area. As limestone is a major ingredient in concrete, if the quarry is successful, Howard plans to build a ready-mix concrete plant at the same location. The investment in the concrete plant is best described as:

选项：

A.

an externality

B.

project sequencing

C.

an example of investment synergy

解释：

Project sequencing occurs when the investment in one project creates the option to invest in future projects.