Answer:
Je vais en prendre trois.
Explanation:
It would be A.
The French use the 24 hour clock.
For example:
Military Time: 12:00, 1:00, 2:00... 11:00, 12:00, 1:00...
24 hour clock: 12:00, 1:00, 2:00... 11:00, 12:00, 13:00...
So basically they say each hour as it comes, as to not be confused.
So therefore it would be A.
There are some endings that are typically masculine such as –on, but if you find it coming after a letter s or the letter c, it will often be feminine. Nouns that end in consonants like t, x, d, l, f, m or s, etc. tend to all be masculine words.