Find the sum of an infinite geometric series, but only if it converges!

Problem

If the following infinite geometric series converges, find its sum.
sum, start subscript, k, equals, 0, end subscript, start superscript, infinity, end superscript, 12, left parenthesis, 0, point, 25, right parenthesis, start superscript, k, end superscript, equals
Please choose from one of the following options.
Get 3 answers correct in a row