Select the sentence from the given options that conforms to Standard English Usage.
1
Allen living at times when botany was a popular scientific subject for women in higher social classes.
2
Allen lived at a time when botany have been a popular scientific subject for woman in highest social classes.
3
Allen lived at a time when botany was a popular scientific subject for women in the higher social classes.
4
Allen lived at time while botany was a popularly scientific subject for women in higher social classes.