Question 16: VerticalCOMPREHENSIONRead the following unedited passage and pick the statement(s) that is/are accurate among the options provided.The environment is negatively affected by emissions of conventional internal combustion (IC) engines, since they emit a lot of greenhouse gases and other harmful pollutants. This necessitates the search for alternative fuels with low carbon emissions for IC engines [1–2]. Hydrogen, a clean and renewable resource, is considered a promising candidate by many researchers [3–5]. Automobile manufacturers have developed hydrogen-fueled internal combustion engines (HICEs) and tests have shown that HICEs have good power performance and reliability, with almost zero carbon emissions [6–10]. However, NOX is one of the major pollutants emitted by HICEs. HICEs usually generate large amounts of NOX emissions under high loads, which is an inevitable phenomenon and is attributed to the temperature rise in the cylinder [11–14]. Technologies such as lean burn, retarded ignition, and exhaust gas recirculation have been found to be effective in reducing NOX emissions. These studies have investigated the variation in NOX emissions with changes in the control parameters of IC engines, using experimental methods. However, the mechanism of NOX formation has not been discussed in sufficient detail.Conventional internal combustion (IC) engines emit large quantities of greenhouse gases and other harmful pollutants, which have an adverse impact on the environment.In their search for alternative fuels that use less carbon in IC engines, researchers have found that hydrogen can be used to create a fuel that may be considered promising.Because of the temperature rise in the cylinder, HICEs generate a lot of NOX emissions under high loads through lean burn, retarded ignition, and exhaust gas recirculation.In some previous studies, researchers have focused on how NOX emissions vary with changes in the control parameters of IC engines, using experimental methods, but the mechanism of NOX formation needs to be investigated further.