Q: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Question: On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is:

Option A: 47619

Option B: 47719

Option C: 48619

Option D: 47649

Option E: 47659
A:
Option A