Can someone please help me with this question?: Choose the progressive perfect form of the verb!

Antonio along the river when someone began to pelt him with oranges.

Choose 1

(Choice A)
A
was walking

(Choice B)
B
had been walking

(Choice C)
C
had walked

Please don't give me a wrong answer. I'm trying so hard to get every one of these right

Which of the following arguments uses a non sequitur fallacy? a. if we allow students to wear caps to school, soon we'll have to let them wear gang colors. b. you should vote for sylvia for class president because everyone else on the squad is voting for her. c. regulations on motorists should be lifted because factories are a bigger source of pollution. d. the gray wolves of winter falls park should be protected because they need our support.

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What happens once in a minute twice in a moment and never in a thousand years?