Fred M. White's book 'The Four Days' Night' describes the disaster and pollution. Hackness is sure about the incoming fog as he measures the weather conditions by the instruments. Thus, option A is correct.
What is fog?
Fog is a form of precipitate that contains vapourised water suspended into fine particles due to low-temperature conditions. It can be measured by the weather instruments.
The instrument measures the sunlight, wind pressure, and atmospheric mass, which deduced that London might face a situation of heavy fog. This estimation made Hackness confident about the outcomes.
Therefore, option A. Hackness deduced the incoming conditions of fog by the instruments.
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