What can strain network infrastructure as more people use the internet?

The correct choice highlights that large amounts of data being transmitted can indeed place a strain on network infrastructure, particularly as internet usage increases. When a significant number of users access the internet simultaneously, the volume of data being uploaded and downloaded can overwhelm bandwidth capacities, leading to slower speeds and potential interruptions. This phenomenon often occurs during peak usage times or in densely populated areas where many devices are connected to the same network, resulting in a bottleneck effect.

While limited mobile signal can impact access to the internet, it does not inherently strain the infrastructure itself; rather, it affects user experience. High-speed broadband connections refer to improvements in technology that aim to increase capacity and reduce strain on networks, rather than contributing to it. Low user engagement rates are not a factor in network strain since they imply fewer users, which would actually relieve pressure on infrastructure rather than increase it. Therefore, the transmission of large amounts of data is the primary factor among the provided choices that can lead to network strain as user activity grows.