Which Greek letter corresponds to the English letter 'R'?

The Greek letter that corresponds to the English letter 'R' is Ρ, which is pronounced as 'rho.' In the Greek alphabet, each letter has a unique shape and phonetic sound, and Ρ is specifically used to represent the 'R' sound similar to how it is pronounced in English. Understanding the Greek alphabet is essential not only in linguistic studies but also in fields such as mathematics and science, where Greek letters frequently denote variables and constants. The other letters listed do not represent the 'R' sound; for example, Φ (phi) corresponds to an 'F' sound, Ψ (psi) corresponds to a 'Ps' sound, and A is simply the English letter. Thus, selecting Ρ as the answer accurately reflects the relationship between Greek and English letters.