CFA Mock Question 34, spread duration - spoiler?? guess, comparing, example, wrong

mp3bu

I guess the answer would be based on comparing weighted spread. If that is the case, the answer is wrong. There is an example in the CFA EOC.
Any thought?

Zesty

I see it says ‘contribution to spread duration’. I thought it was spread duration of that sector. Thanks Ozzy.
There is an EOC, in that we have to calculate contribution.

cfalevel2011

I’m not sure what you mean by “comparing weighted spread”. The question seemed pretty straight forward to me.
Can you elaborate a little more?