In lines 140-150, what hasn't changed is that the father still switches off the electricity generator at 10 p.m. and goes to sleep in his study. The expression "as was custom" marks that this has not changed.
The language that shows that the father is changing can be found in lines 141, 173 and 175-176:
In line 141 we learn that he does not use certain rooms ("rooms we'd stopped using").
In line 173 we read that the father "seemed lighter" and chatted with his son.
In lines 175-176 the father says that "now he might be able to come to the end-of-the-year recital" at his child's school.
The words that provide clues to the meaning of 'alpenglow' are sunbursts of morning, floods of light
Alpenglow is an optical phenomena that appears as a horizontal reddish glow close to the horizon opposing the Sun when the solar disc is just below the horizon.
Alpenglow, in its purest form, is the term used to describe the indirect sunlight that the atmosphere reflects or diffracts after sunset or just before daybreak. Along with the reddish hue, this diffuse illumination produces soft shadows. The phrase is often used colloquially to refer to shadows that are clearly defined and are directly illuminated by the reddish light of the rising or setting sun.
Learn more about Alpenglow here:
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I just did this quiz and I put (C) and (D) and it was correct. : )