The correct answer is option a) so.
The sky was dark so I took an umbrella with me.
As a conjunction, ‘so’ is used to show the effect or result.
Non finite verb
According to the definition of a nonfinite verb, it is impossible for it to act as the primary verb in an independent phrase. This essentially indicates that they don't act as the action of a sentence.
Furthermore, they lack a tense. The non-finite verbs themselves are neutral, regardless of whether the phrase around them is in the past, present, or future tense.
Infinitives, participles, and gerunds are the three different categories of non-finite verbs.
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