The first blank corresponds to the world Síganme which is the imperative form of seguir.
The second blank corresponds to the world dígame which is the imperative form of decir.
Let me also translate the text for you:
Agent: well, you already saw the garden. Now follow me/síganme I want to show the inside of the house.
Cecilia: Wow! such a beautiful hallway! there is a lot of natural light here, but tell me/dígame Mr. Orozco, there is only one entrance?
The answer would be jugar
B. lo.
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The answer is a) Dice because it has the usted ending. Digo is the yo ending. Dicen is the ustedes ending. Decimos has the nosotros ending.