Susana, ¿ te gusta vestido que tengo puesto?
a. ese b. este c. esa d. esta

This is a good example of the usage of the demonstrative adjective este (this).

The demonstrative adjectives in Spanish are those words that accompany the noun to mark the distance that separates the speaker from the object, place or person to which they refer.

They agree in gender and number with the noun they modify.

The three demonstrative adjectives are:

Este (This): It describes a noun that is close to the speaker and the listener.  

Ese (That): It points out nouns that are further from the speaker and not easily reachable. The noun may be close to the listener, but not the speaker.

Aquel (That over there): It is referred to nouns that are far away from both the speaker and the listener.

Note, in Spanish the Demonstrative Adjective is generally written before the noun it modifies.

Now, in this interrogative sentence, someone is asking to Susana about a dress which is wearing, this means the dress is quite close to the speaker.

In addition, vestido (dress) is a singular masculine noun.

Therefore the right option that agrees in gender and number with vestido (according to the previous explanation) is the demonstrative adjective este (this).

The complete sentence is as follows:

Susana, do you like this dress that I am wearing?

the answer is c. pero

explanation:

you only want ot speak with the employee not the director