C. It just seems right. And it doesn't day anything about atoms. That's guess.
Generally, the rate of a reaction will decrease with increasing temperature, although there are some exceptions in the case of non-elementary reactions. However it is more likely that the first statement is false.
Half-life is a measure of the time taken for a to reach 1/2 of its initial concentration, and is generally completely independent of reagent concentration within a first order reaction, which is likely what this reaction is, therefore statement 2 is also likely false.
Hope this helps!
Ca, V, Cu, Kr
Remember a period is a the horizontal rows in the Periodic Table.
