Select the grammatically correct choice:

1. I’m looking for an assistant on whom I can depend.
2. I’m looking for an assistant on who I can depend.

1. I’m looking for an assistant on whom I can depend.

The grammatically correct choice is:

1. I’m looking for an assistant on whom I can depend.

The grammatically correct choice is:

1. I’m looking for an assistant on whom I can depend.

To determine the grammatically correct choice, you can follow these steps:

1. Identify the type of pronoun being used. In this case, it's a relative pronoun, specifically "whom."

2. Understand the function of the pronoun in the sentence. "Whom" is used as the object of the preposition "on" in this sentence. It refers to the assistant.

3. Check if the pronoun is correctly used in its objective form. In this case, "whom" is used correctly as it is the object of the preposition. It is the grammatically correct form for referring to the assistant in the sentence.

Based on these steps, option 1 is the correct choice as it uses the pronoun "whom" correctly.