Explanation:

- Transport: Vital for economic development, but low-income countries may face challenges due to high costs and infrastructure maintenance.

- Irrigation: Crucial for agriculture, especially in agriculture-dependent economies, though underfunded due to financial constraints.

- Power: Essential for industry and households, but investment is often limited due to high infrastructure and generation costs.

- Telecommunication: Increasingly important, but often lags in investment because of cost and technological barriers.

The correct answer is that low-income countries might invest less in Telecommunication systems compared to the others due to cost and tech barriers.