Question

note that a probability map is not the same as a balloon model
1 is a probability map of a single s orbital in cross-section
2 is a probability map of a single p orbital in cross-section

Explanation:

1. An s orbital's cross-sectional probability map is a circular, symmetric shape centered on the nucleus, matching figure (b).
2. A p orbital's cross-sectional probability map has two lobes along an axis, matching figure (d).

Answer:

1. (b)
2. (d)