Ritu is a bridesmaid in her friend's wedding. She needs to find royal blue shoes that she will be able to wear for over five hours. She has found three pairs that she likes in the height range she is looking for at The Bay and one more at DSW$.$ She is going to go back to the stores with a fabric swatch to identify which pair is the closest to the colour she wants. Ritu is at which stage of the consumer decision$-$making process?

a$.$ Information search

b$.$ Purchase

c$.$ Evaluation of alternatives

d$.$ Postpurchase behaviour