Final answer:
Manny is hesitant to visit Death Valley due to the potential extreme heat, reflecting the text's exploration of the harshness of extreme weather conditions.
Step-by-step explanation:
Manny is unsure about going to Death Valley at the beginning of the text due to concerns about the hot weather. The provided passages indicate a focus on challenging and extreme environments. For instance, one excerpt describes a man's struggle for survival in the freezing Yukon, highlighting the theme of perseverance in hostile weather conditions. Another passage discusses the difficulties of rescuing people from the desert heat, and Josh's dangerous situation of running out of water during a trek through the desert in midsummer illustrates the severe risk posed by dehydration and heatstroke in such unremitting heat. These themes all point to the harsh realities of extreme weather, whether cold or hot, and align with option D: Manny is worried that the weather will be too hot. This answer takes into account the dangers associated with extreme temperatures as seen through the text excerpts that describe similar inhospitable environments.