Read about the Earth's tectonic plates, then answer the questions about the text, choosing either A, B, or C as the best answer for each of the questions.

In many parts of rural Africa, access to reliable electricity has been a persistent challenge for decades. Traditional power grids often fail to reach remote communities, leaving millions dependent on costly and polluting energy sources such as diesel generators or kerosene lamps. However, recent advances in renewable energy technology are transforming the situation, offering cleaner, more affordable, and sustainable solutions.

One such innovation is the installation of solar microgrids. These are small-scale electricity networks powered entirely by solar panels, often combined with battery storage. Unlike large national grids, microgrids can be set up quickly and maintained locally, providing power to households, schools, and businesses without the need for extensive infrastructure. In Tanzania, for example, a pilot project has brought electricity to over 2,000 people, enabling children to study at night and local entrepreneurs to expand their businesses.

Another promising approach is the use of pay-as-you-go (PAYG) solar home systems. Customers purchase these systems through small daily or weekly payments, often via mobile phone apps. This model makes solar technology accessible to families who cannot afford the full cost upfront. Once the system is paid off, the household owns it outright, enjoying free electricity for years to come.

The benefits of renewable energy in rural Africa go beyond lighting and phone charging. Access to electricity can improve healthcare by powering refrigeration for vaccines and operating medical equipment. It can also support agricultural productivity, for instance, by running irrigation pumps or processing equipment. Moreover, replacing diesel or kerosene reduces greenhouse gas emissions and indoor air pollution, improving both environmental and human health.

Despite the progress, challenges remain. Initial installation costs, even when spread out, can still be high for some households. Maintenance requires technical skills that are not always available locally. Furthermore, political instability and weak regulatory frameworks can slow the spread of renewable energy projects.

Nevertheless, the success of current initiatives shows that with the right investment and community engagement, renewable energy can play a central role in bridging Africa’s rural electricity gap - creating opportunities for economic growth, improving quality of life, and contributing to a more sustainable future.

What does “these” in paragraph 2 refer to?