Choose the right option1) I saw Jack _________a) to climbing up

Choose the right option
1) I saw Jack _________
a) to climbing up the ladder
b) to climb up the ladder
c) climbing up the ladder
d) having climbed up the ladder
2) It's a waste of time _________
a) to spend time on this issue
b) spending time on this issue
c) to spending time on this issue
d)spent time on this issue