The correct answer is (c). Mathematics and Geography are two different subjects. Mathematics is a branch of science that deals with the logic of shape, quantity, and arrangement. Geography is the study of the Earth and its features, including physical features (such as mountains, rivers, and oceans), human features (such as cities, roads, and buildings), and the interactions between them.
(a) Air and Oxygen are both gases. Air is a mixture of gases, including oxygen, nitrogen, argon, carbon dioxide, and other gases. Oxygen is a gas that is essential for life.
(b) Teacher and Student are two roles in a learning environment. A teacher is someone who helps students learn, while a student is someone who is learning.
(d) Physics and Science are both broad fields of study. Physics is the study of matter and energy and their interactions. Science is the study of the natural world through observation and experiment.