Can anyone answer this science question? No links please Which constellation is found at approximately -15° declination and 4 hours 40
minutes right ascension?

Lepus

Canis Major

Eridanus

Taurus

Eridanus.

Explanation:

Eridanus is a constellation recorded in antiquity by Ptolemy and is one of the 88 official constellations established by the International Astronomical Union.  

It is located south of the zodiac constellations Aries and Taurus, and includes about 126 stars visible to the naked eye from 1st to 6th magnitude. It is considered the longest of the constellations: it starts from the celestial equator and ends at the 60th southern celestial parallel.

"d.) carbon dioxide and hydrogen sulfide"