Answer:
All these options are correct.
Explanation:
Palynology is the study of the record formed by living and fossilized pollen grains and spores. Paleontologists use this technique to understand different evolutionary and geographical processes as described in the options of this question. Since the pollen grains and the spores are geographically specific and sensitive to the climate, this technique is used in order to reconstruct past vegetation and to describe past climatic conditions, being also useful to describe evolutionary events such as extinction and radiation processes.