Answer: Option B: constructive interference
Explanation: When two waves find in a point in space, and the resultant wave is a bigger wave, this means that there has been a "constructive interference", where constructive means that the waves are "constructing" with each other, and interference is the phenomena that happen when two waves meet.
The other case, if after the two waves meet, the result is a smaller wave (or not wave at all) its called "Destructive interference"
