Researchers have developed a simple mathematical model that suggests that microbes living in sauropod dinosaurs produced enough methane to have an important effect on Earth's climate 150 million years ago.
[A] that suggests that microbes living in sauropod dinosaurs produced
suggesting that microbes living in sauropod dinosaurs may have produced
[C] to suggest that microbes living in sauropod dinosaurs may have produced
[D] that suggests that microbes living in sauropod dinosaurs may have been producing
[E] that suggested that microbes living in sauropod dinosaurs had produced
Isn't Option D the best Option? Can some experts explain? Thanks
OA A
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Researchers have developed a simple mathematical model
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