Question

How would a houseplant respond to sunlight that comes from one direction?. . . . A.. by closing its leaves at night. . . B.. by curling its stem around its leaves. . . C.. by bending its stem toward the sun. . . D.. by growing roots downward through the soil

Answer 1

Yes, your answer is C. By bending its stem towards the sun. 

Answer 2

the way a houseplant respond to sunlight that comes from one direction is : C. By bending it stem toward the sun
By doing this, the plant intend to get the maximum amount as possible to fulfill its photosynthetic needs

hope this helps