Foreshocks are simply known as an earthquakes that often comes before a larger earthquakes in the same location. The earthquake 3.7 and 3.2 represent a foreshock.
Earthquakes that fall between the ranges of 3.0 to 3.9 on the scale are said to be small or minor earthquakes.
In this type of earthquakes, one can feel the earthquake, and objects inside shaking around, but it rarely damage.
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A seismograph records four earthquakes of magnitude 3.7, 3.2, 6.5 and 4.3 and then seismicity decreases. Which earthquake(s) represent (a) foreshock(s)?
a. 3.7 and 3.2
b. 3.2 only
c. 3.7 only
d. 3.7 and 6.5
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