The correct answer is Option 2: 3 only. The photoelectric effect is correctly associated with Albert Einstein.

Let`s go through each option and analyze the pairing:

1. Continental Drift - Edwin Hubble: This pairing is incorrect. The theory of continental drift was proposed by Alfred Wegener, not Edwin Hubble. Continental drift is the idea that the Earth`s continents were once joined together in a single landmass called Pangaea and have since moved apart. Edwin Hubble, on the other hand, is known for his work on extragalactic astronomy and establishing the idea of an expanding universe.

2. Expansion of Universe - Alfred Wegener: This pairing is also incorrect. Alfred Wegener is the scientist associated with the theory of continental drift, as mentioned above. The expansion of the universe is a concept in cosmology that describes how the space between galaxies is constantly increasing. The discovery and confirmation of the expanding universe were made by Edwin Hubble, who measured the redshift of distant galaxies and formulated Hubble`s Law.

3. Photoelectric Effect - Albert Einstein: This pairing is correct. The photoelectric effect refers to the emission of electrons from a material when it is exposed to light or electromagnetic radiation. Albert Einstein`s explanation of the photoelectric effect in 1905 earned him the Nobel Prize in Physics in 1921. He proposed that light is made up of discrete particles called photons and that the energy of these photons is directly related to their frequency. This work on the photoelectric effect was crucial in establishing the concept of quantized energy and the foundation of quantum mechanics.

To summarize, the only correctly matched pair is Option 2: 3 only, where the photoelectric effect is correctly associated with Albert Einstein.