Which decimal is greater than 0.07 but smaller than 0.15?

1. Convert all options to two decimal places for easy comparison

The given range is between $0.07$ and $0.15$.
Option (1): $0.1 = 0.10$
Option (2): $0.9 = 0.90$
Option (3): $0.01 = 0.01$
Option (4): $0.19 = 0.19$

2. Identify the decimal that falls within the range

Comparing the hundredths:
$0.01 < 0.07$ (too small)
$0.07 < 0.10 < 0.15$ (correct)
$0.19 > 0.15$ (too large)
$0.90 > 0.15$ (too large)
Therefore, $0.1$ is the correct answer.