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Kolkata, Mumbai, Mangalore

Protagonist and heroine are synonums to each other. Similarly, clothing and jeans are synonyms to each other in the given options. 

Hence, Protagonist is to heroine as clothing is to jeans.

Inflection most often refers to the pitch and tone patterns in a person's speech that is where the voice rises and falls.

Hence, Inflection best relates to Tone.

Ration synonyms are allowance, consignment, quota,...

Here the given numbers are related in such a manner that,

$$\begin{gathered} 52 = 25 \\ 5+12 + 1 = 37 \\ Similarly, \\ 72 = 49 \\ 7+12 + 1 = 64 + 1 = 65 \end{gathered}$$

Hence, 25 : 37 :: 49 : 65.

As we know that an artist makes paintings, similarly, a senator makes laws.

Hence, Artist : Painting :: Senator : Law.

As Microphone makes sound louder similarly Microscope makes the object magnified.

Hence, Microphone : Loud :: Microscope : Magnify.

We park car temporarily in garrage, similarly, aeroplane is temporarily parked in hangar.

Here if you observe, add and subtract are opposite in nature. Similarly, mutiply and divide are also opposite in nature.

Hence, Add : Multiply :: Subtract : Divide.