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Because 
is increasing, you know that 
, which means 
must be concave upward over its domain, so A is strue.
By the same fact above, you also know that D must be true.
Relative extrema occur for points where
, and you know that the graph of crosses the x-axis at 
, so this is also true.
That leaves B. Why is it false? Inflection points occur at points where
, where the sign of 
changes to either side of 
. But you know that is always true, so there is no such that makes .
By the same fact above, you also know that D must be true.
Relative extrema occur for points where
That leaves B. Why is it false? Inflection points occur at points where