Answer:
We saw a pack of___ when we went hiking yesterday.
a: wolves.
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Which one of the following is a singular word?
c: mathematics.
Explanation:
The plural of words that either end in "f" or "fe" is formed by dropping "f" or "fe" and replacing those with "ves".
Eg.: 1 wife Β - Β 2 wives / Β Β Β 1 knife - Β 2 knives / Β Β Β 1 half - Β 2 halves Β Β
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The noun "mathematics", as other sciences, ends with the suffix "ics", and as so it is considered to be a singular noun, since it is the name of a single science.
Eg.: physics - robotics - linguistics - ethics, etc.
