1. write the balanced chemical equation for the reaction
naoh + hcl → nacl + h2o

2. extract the relevant information from the question:
naoh v = 30 ml , m = 0.10 m
hcl v = 25.0 ml, m = ?

3. convert milliliters to liters
naoh v = 0.03 l , m = 0.10 m
hcl v = 0.025 l, m = ?

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

the right answer is c i just did the question.

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