Suffix question

Hi writers,

My 3rd grade daughter received practice worksheets for her state mandated testing which she is undergoing this week. This was one of the problems she practiced on at home to familiarize herself with the testing format:


Find the word in which only the suffix is underlined:
1. landed
2. closet
3. storms
4. television

Can someone help me out with the answer here? The following is my thinking regarding the options:

?

1. landed: The -ed shows a tense ending and isn't considered a suffix (verbal/tense endings don't count as suffixes, I believe.)
2. closet: the -et is part of the base word
3. storms: the -ms is part of the base word
4. television: -vision IS the base word and tele is a greek prefix meaning distance. (telephone, telecommunications, etc.)

So what's the answer?

I think the state's answer must be either 1 or 4. If a verbal ending can be a suffix, then multiple other answer options within my daughter's practice packet are done incorrectly.

So I'm thinking the state is wrong, but I'm not confident/hubristic enough to force the issue with the school yet. Educate me, please, on suffixes! Thanks you!

Thanks so much!