RMS speed of gas molecules and peak of Maxwell distribution

[davon806]

Homework Statement

As attached.

Homework Equations

The Attempt at a Solution

I chose A but the correct answer is E.(Actually I thought both of them were correct)
From the graph provided,it is clear that the turning point corresponds to the largest proportion of molecules,so is the corresponding speed = rms speed?If yes,then A must be true?

 

[TSny]

The most probable speed is not the same as the rms speed.

See the graph here: http://ef.engr.utk.edu/hyperphysics/hbase/Kinetic/kintem.html