Step 1 :\( \text{Words per minute} = \frac{\text{Total words}}{\text{Total minutes}} \)
Step 2 :\( \text{Words per minute} = \frac{90}{5} \)
Step 3 :\( \text{Words per minute} = 18 \)
Step 4 :So, Marsha types at a rate of 18 words per minute.
Step 5 :Now, let's find Clay's typing rate using the points (3,54).
Step 6 :\( \text{Words per minute} = \frac{54}{3} \)
Step 7 :\( \text{Words per minute} = 18 \)
Step 8 :So, Clay also types at a rate of 18 words per minute.
Step 9 :\(\boxed{\text{Therefore, Marsha and Clay type at the same rate, so none of the given options is correct.}}\)