Sirius can be located by which constellation?
A. The great bear
B. Cassiopeia
C. Orion
D. Leo Major

Hint: Sirius is the brightest star in the night sky. It is located close to a certain constellation of stars which has the shape resembling that of an hourglass. By locating this constellation, we can easily reach the nearby Sirius.

Complete step by step answer:
A constellation is a group of stars in the sky which form a certain distinctive pattern which the humans relate to earthly things with respect to their shape.
Sirius is the brightest star in the night sky. It is located close to an hourglass shaped constellation called Orion. The Orion constellation consists of seven stars forming a shape distinctively close to an hourglass. If we draw a straight line and throw the three stars forming a line at the middle of the Orion constellation, then it will lead us to the Sirius.

Hence, we can say that the correct answer is option C.

Additional information:
The pole star is fixed along the north direction of earth and appears stationary with respect to earth. All other stars and constellations can be observed to move around with the rotation of earth.
The great bear, as the name suggests, almost has the shape of a bear.
The Cassiopeia constellation has a W-shape.
The Leo major constellation is relatable to the outline of a lion.

Note:
1. The constellations also served as a method of navigation during historical times.
2. The constellations which appear to have a certain shape from the surface of earth might be completely different when viewed from another planet like Mars. On Mars, we might be able to recognize some completely new constellations which cannot be observed in the same shape from earth.