You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Question: The electrons with the _____ energy are nearest to the nucleus. 
 Option1: most 
 Option2: least 
 Explanation: Electrons at higher energy levels, which are farther from the nucleus, have more energy.
least

Question: NASA has sent an unmanned probe to survey a distant solar system with four planets. Planet Zorb is farthest from the sun of this solar system, Planet Krakatoa is second farthest, Planet Beanbag is third, and Krypton is the closest. The probe visits the planets in order, first Zorb, then Krakatoa, then Beanbag and finally Krypton. Did the probe have to fly farther in its trip from 
 Option1: Zorb to Krakatoa or 
 Option2: from Beanbag to Krypton? 
 Explanation: In general, the farther away from the Sun, the greater the distance from one planets orbit to the next.
Zorb to Krakatoa or

Question: Suppose that Mary smokes cigarettes for 20 years. If you measured the oxygen levels in her blood before she started smoking and compared them to oxygen levels later in her life, what would you find? 
 Option1: less oxygen in her blood later in life 
 Option2: more oxygen in her blood later in life 
 Explanation: Smoking reduces the amount of oxygen available for diffusion at the lungs, so less oxygen gets absorbed and blood is oxygenated to a lesser degree.

less oxygen in her blood later in life