The test-tubes were arranged as shown in the table. In which test-tube would the starch be digested most rapidly? The table shows: $2\text{ cm}^3$ starch suspension added, $1\text{ cm}^3$ of amylase added, $1\text{ cm}^3$ of boiled amylase added, temperature / $^\circ\text{C}$.
- Astarch present, amylase present, boiled amylase absent, $5^\circ\text{C}$
- Bstarch present, amylase present, boiled amylase absent, $35^\circ\text{C}$
- Cstarch present, amylase absent, boiled amylase present, $5^\circ\text{C}$
- Dstarch present, amylase absent, boiled amylase present, $35^\circ\text{C}$