Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 39 to 45.

Children are not the face of this pandemic, but they risk being among its biggest victims. While they have thankfully been largely spared from the direct health effects of COVID-19 - at least to date – the crisis is having a profound effect on their wellbeing. All children, of all ages, and in all countries, are being affected, in particular by the socio-economic impacts and, in some cases, by mitigation measures that may inadvertently do more harm than good. This is a universal crisis and, for some children, the impact will be lifelong. Moreover, the harmful effects of this pandemic will not be distributed equally. They are expected to be most damaging for children in the poorest countries, and in the poorest neighborhoods, and for those in already disadvantaged or vulnerable situations.

There are three main channels through which children are affected by this crisis: infection with the virus itself; the immediate socioeconomic impacts of measures to stop transmission of the virus and end the pandemic; and the potential longer-term effects of delayed implementation of the Sustainable Development Goals.

All of this is affecting children in multiple ways. An estimated 42-66 million children could fall into extreme poverty as a result of the crisis this year, adding to the estimated 386 million children already in extreme poverty in 2019. 188 countries have imposed countrywide school closures, affecting more than 1.5 billion children and youth. The potential losses that may accrue in learning for today’s young generation, and for the development of their human capital, are hard to fathom. More than two-thirds of countries have introduced a national distance learning platform, but among low-income countries the share is only 30 percent. Before this crisis, almost one-third of the world’s young people were already digitally excluded.

Lockdowns and shelter in place measures come with a heightened risk of children witnessing or suffering violence and abuse. Children in conflict settings, as well as those living in unsanitary and crowded conditions such as refugee and IDP settlements, are also at considerable risk. Children’s reliance on online platforms for distance learning has also increased their risk of exposure to inappropriate content and online predators.

(Adapted from https://unsdg.un.org/

The word “fathom” in paragraph 4 most probably means _________.