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英語 高校生

長文中の空所(10)に入れるのに最も適当な文を選択する問題です。答えはdなのですが、解説を読んでもなぜdになるのかあまりよく分かりませんでした。なぜdが正解でなぜ他の選択肢は間違いなのか教えていただきたいです。 3つ目の画像は赤本の解説です。よろしくお願いします。

fossil known 4S “Lucy,” 4zsが6272の27がecz4S の27e2S7s from 3.2 mmillion years ago Thcsc MRDSHIR. Lucy was a 1ot jike a impenzeeGc (hat shc Co計時ISHII Sightly bigger brain. Her skin was not preserved, but _She Was probably covered with far. However, between two and three millions years ago Our_ancestors began to inhabit more open savannahs meant the 1 e oO 8 y were out 后 fe sum ーー) 『 glaring heat for many more hours each day. Around the same time, they also started to hunt and eat more meat and game animals were more abundant in the open. This move into open Spaces offered an explanation for our lack of hair. Im the 1990s, Peter Wheeler of Liverpool John Moores University im the UK came up with a mathematical model showing how much excess heat ⑧ hominins would need to lose in open habitats in order to function。 HE their brains got too hot their thought processes would 0 PA If the hominins were covered in hair, they could not have lost heat fast enough. Wheeler reasoned that ( 10 ) allowed our ancestors to keep cool. One was an upright gait. Walking on two legs meant that only the tops of their bodies were under direct sunlight. But the hominins also started running long distances. This meant they ould bring down large garme animals by running them to exhaustion, but

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