Fill in the blanks with the most appropriate option:-

My elder brother is afraid _______ reptiles.

of

The most appropriate option to fill in the blanks is of.

The word "of" is a preposition that means to be afraid of something. In the context of the sentence, "My elder brother is afraid of reptiles", my elder brother is afraid of reptiles. The other options are not as appropriate.

• From means to move away from something. This does not make sense in the context of the sentence, as my elder brother is not moving away from reptiles.
• To means to move towards something. This does not make sense in the context of the sentence, as my elder brother is not moving towards reptiles.
• For means to have a purpose or reason for something. This does not make sense in the context of the sentence, as my elder brother does not have a purpose or reason for being afraid of reptiles.