The correct option is A One hundred twenty five and three tenths.
Step 1: Write the word form of the digits in the whole-number part.
125––––.3→one hundred twenty five
Step 2: Write "and" for the decimal point.
125.–3→one hundred twenty five and––––
Step 3: Write the word form of the digits in the decimal part 125.3
125.3–→one hundred twenty five and three––––––
Step 4: End with the place value of the last digit. The place value of 3 in 125.3 is tenths
125.3–→one hundred twenty five and three tenths–––––––.
Hence, 125.3 will be read as one hundred twenty five and three tenths.