An investigation involves determining which metal is better for making pots that will cook food faster. which is the best hypothesis to use for this investigation?

Because the specific metals aren’t mentioned in this inquiry. The educational guesses that we can propose is that:
1.    The hypothetical inquiry: There are existing metals for making pots that will cook food much faster.

2.    The one-tailed alternative hypothesis: There are other metals for making pots that will cook food much faster than the other metals.
3.    The one-tailed null hypothesis: All metals that are used in making pots will cook food at an equal rate.

The answer is  a.first and third quarters 

The correct choice is c