October 1997 LSAT Section 3 Question 22

Helen: It was wrong of my brother Mark to tell our mother that the reason he had missed her birthday party the eve...

Sangwook on September 11, 2014

Help

I can't clearly understand the weakness of Helen's justification and why (E) is the answer for this question. Please help~ Thanks,

Melody on September 18, 2014

The response to this question is in the other thread.